EduSahara™ Assignment
Name : Proportion Concepts
Chapter : Ratio and Proportion
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
Find the missing value in the equation
____
:
1
=
4
:
2
(i)
2
(ii)
1
(iii)
0
(iv)
5
(v)
3
Question
2
2.
Find the missing value in the equation
8
:
____
=
16
:
4
(i)
3
(ii)
2
(iii)
0
(iv)
1
(v)
4
Question
3
3.
Find the missing value in the equation
34
:
1
=
____
:
8
(i)
271
(ii)
275
(iii)
273
(iv)
269
(v)
272
Question
4
4.
Find the missing value in the equation
20
:
5
=
16
:
____
(i)
4
(ii)
3
(iii)
1
(iv)
7
(v)
5
Question
5
5.
Find the product of extremes of
15
:
13
and
6
:
19
(i)
285
(ii)
284
(iii)
283
(iv)
288
(v)
78
Question
6
6.
Find the product of extremes of
1
8
:
14
19
and
15
14
:
4
3
(i)
15
19
(ii)
1
2
(iii)
1
6
(iv)
1
4
(v)
(
-1
6
)
Question
7
7.
Find the product of means of
8
:
7
and
20
:
3
(i)
24
(ii)
140
(iii)
142
(iv)
139
(v)
137
Question
8
8.
Find the product of means of
11
15
:
18
13
and
11
9
:
11
15
(i)
24
13
(ii)
22
13
(iii)
2
(iv)
20
13
(v)
121
225
Question
9
9.
Find the mean proportional of
50
and
2
(i)
10
(ii)
50
(iii)
100
(iv)
2
(v)
8
Question
10
10.
Find the third proportional of
27
and
9
(i)
3
(ii)
81
(iii)
9
(iv)
1
(v)
27
Question
11
11.
Find the fourth proportional of
28
,
7
and
24
(i)
24
(ii)
9
(iii)
6
(iv)
4
(v)
7
Question
12
12.
Which of the ratios is proportional to 28 : 7?
(i)
36
:
7
(ii)
36
:
11
(iii)
37
:
9
(iv)
35
:
9
(v)
36
:
9
Question
13
13.
Find the mean proportional of
128
and
2
(i)
2
(ii)
14
(iii)
128
(iv)
256
(v)
16
Question
14
14.
Find the third proportional of
18
and
6
(i)
36
(ii)
6
(iii)
(-1)
(iv)
2
(v)
18
Question
15
15.
Find the fourth proportional of
30
,
5
and
30
(i)
7
(ii)
3
(iii)
30
(iv)
5
Question
16
16.
Which of the ratios is proportional to 20 : 5?
(i)
32
:
10
(ii)
33
:
8
(iii)
31
:
8
(iv)
32
:
6
(v)
32
:
8
Question
17
17.
If
a
:
b
::
c
:
d
,
then
(i)
ac = bd
(ii)
ad = bc
(iii)
ab = cd
(iv)
abc = bcd
Question
18
18.
The ratio 5 : 3 is proportional to which of the following ratios?
(i)
15
:
9
(ii)
20
:
15
(iii)
30
:
6
(iv)
10
:
18
(v)
25
:
12
Question
19
19.
Which of the following represents a proportion ?
(i)
49
:
41
::
98
:
123
(ii)
46
:
38
::
184
:
114
(iii)
48
:
40
::
192
:
160
(iv)
50
:
42
::
150
:
84
(v)
47
:
39
::
141
:
156
Question
20
20.
Which of the following does not represent a proportion ?
(i)
24
:
18
::
48
:
36
(ii)
14
:
10
::
42
:
30
(iii)
15
:
9
::
60
:
36
(iv)
16
:
8
::
80
:
40
(v)
6
:
4
::
12
:
12
Question
21
21.
If
a
:
b
::
c
:
d
,
then '
d
' is called
(i)
second term
(ii)
third proportional
(iii)
first term
(iv)
mean proportional
(v)
extreme
Question
22
22.
If
a
:
b
::
b
:
c
,
then '
b
' is called
(i)
mean proportional
(ii)
first term
(iii)
extreme
(iv)
fourth proportional
(v)
third proportional
Question
23
23.
If
a
:
b
::
b
:
c
,
then '
c
' is called
(i)
third proportional
(ii)
second term
(iii)
mean proportional
(iv)
first term
Question
24
24.
If
a
:
b
::
b
:
c
,
then the mean proportional is
(i)
bc
(ii)
c
(iii)
a
(iv)
b
(v)
ac
Question
25
25.
If
a,b,c,d,e,f
are in continued proportion, then which of the following is true?
(i)
a
b
=
b
c
=
c
d
(ii)
a
b
b
c
=
b
c
c
d
=
c
d
d
e
(iii)
ab
=
bc
=
cd
=
de
(iv)
a
b
=
c
d
=
e
f
Question
26
26.
If
24
:
18
::
x
:
9
, find '
x
'
(i)
12
(ii)
13
(iii)
15
(iv)
9
(v)
11
Question
27
27.
Find the fourth proportional of 15, 12, 30
(i)
23
(ii)
24
(iii)
25
(iv)
21
(v)
26
Question
28
28.
Find the third proportional of 50 and 10
(i)
(-1)
(ii)
5
(iii)
3
(iv)
1
(v)
2
Question
29
29.
Find the mean proportional of
8
and
32
(i)
16
(ii)
14
(iii)
18
(iv)
17
(v)
15
Question
30
30.
If
5
,
x
,
20
are in continued proportion, find
x
(i)
13
(ii)
11
(iii)
10
(iv)
9
(v)
8
Question
31
31.
Find the mean proportional between
2.5
and
62.5
(i)
10.5
(ii)
12.5
(iii)
14.5
(iv)
11.5
(v)
13.5
Question
32
32.
Find the mean proportional between
√
6
and
4
√
6
(i)
2
√
8
(ii)
2
√
6
(iii)
12
(iv)
2
4
√
6
(v)
2
√
3
Question
33
33.
Find two numbers whose mean proportional is
12
and third proportional is
256
9
(i)
9
and
14
(ii)
9
and
15
(iii)
10
and
16
(iv)
9
and
16
(v)
11
and
16
Assignment Key
1) (i)
2) (ii)
3) (v)
4) (i)
5) (i)
6) (iii)
7) (ii)
8) (ii)
9) (i)
10) (i)
11) (iii)
12) (v)
13) (v)
14) (iv)
15) (iv)
16) (v)
17) (ii)
18) (i)
19) (iii)
20) (v)
21) (v)
22) (i)
23) (i)
24) (iv)
25) (i)
26) (i)
27) (ii)
28) (v)
29) (i)
30) (iii)
31) (ii)
32) (ii)
33) (iv)
