1.

Find the fourth proportional to 2.4, 4.6 and 7.6?

2.

Find the third proportional to 9 and 12?

3.

Find the mean proportional between 49 & 81?

4.

Find the fourth proportional to 0.2,0.12 and 0.3?

5.

If a:b=1:2 and b:c=3:4 find a:b:c?

6.

If a:b=1:2, b:c=3:4 and c:d = 2:3 find a:b:c:d?

**Answer: Option 'B'**

**a:b = 1:2, b:c = 3:4, c:d = 2:3
1:2
3:4
( a = 1 × 3 = 3, b = 2 × 3 = 6 and c = 2 × 4 = 8)
(a = a × b, b= b × b and c= b × c)
a:b:c = 3:6:8
a:b:c = 3:6:8 and c:d = 2:3
(Note: First a,b,c multiplication with c means 2 and last c means 8
multiplication with d means 3
a:b:c:d = 6:12:16:24 **

7.

If a:b=2:3, b:c=4:5 and c:d=4:2 find a:b:c:d?

**Answer: Option 'D'**

**a:b = 2:3, b:c = 4:5, c:d = 4:2
2:3
4:5
( a = 2× 4 = 8, b = 37 × 4 = 12 and c = 3 × 5 = 15)
(a = a × b, b = b × b and c = b × c)
a:b:c = 8:12:15
a:b:c = 8:12:15 and c:d = 4:2
(Note: First a=8,b=12,c=15 multiplication with c means 4 and last c = 15
multiplication with d means 2
a:b:c:d = 32:48:60:30 **

8.

If 2a=6b and 9b=7c, Find a:b:c?

9.

If 0.4:1.4 :: 1:4:x, then x=?

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