- 1. Find the fourth proportional to 2.4, 4.6 and 7.6?

A.14

B.14.657

C.15.56

D.14.56

Answer & Explanation

Answer: Option D

Explanation:**Formula = Fourth propotional = (b × c)/a**

**A = 2.4 , B = 4.6 and C = 7.6**

**(4.6 × 7.6)/2.4 = 14.56**

- 2. Find the third proportional to 63 and 29.9?

A.14.09

B.14.29

C.14.19

D.14.16

Answer & Explanation

Answer: Option C

Explanation:**Formula = Third proportional = (b × b)/a**

**A = 63 and B = 29.9**

**(29.9 × 29.9)/ 63 = 894.01/63 = 14.19**

- 3. Find the mean proportional between 7921 & 9409?

A.8163

B.8633

C.8663

D.8636

Answer & Explanation

Answer: Option B

Explanation:**Formula = √a×b**

**A = 7921 and B = 9409**

**√7921×9409 = 89 × 97 = 8633**

- 4. Find the fourth proportional to 0.5, 1.12 and 1.3?

A.2.914

B.2.81

C.2.192

D.2.912

Answer & Explanation

Answer: Option D

Explanation:**Formula = Fourth proportional = (b × c)/a**

A = 0.5 , B = 1.12 and C = 1.3

(1.12 × 1.3)/0.5

1.456/0.5 = 2.912

A = 0.5 , B = 1.12 and C = 1.3

(1.12 × 1.3)/0.5

1.456/0.5 = 2.912

- 5. If a:b = 4:8 and b:c = 3:2 find a:b:c?

A.3:8:4

B.3:4:8

C.3 : 6 : 4

D.4:6:3

Answer & Explanation

Answer: Option C

Explanation:**a:b = 4:8, b:c = 3:2**

**4:8**

**3:2**

**(a = 4 × 3 = 12, b = 8 × 3 = 24 and c = 8 × 2 = 16)**

**(a = a × b, b = b × b and c = b × c)**

**a:b:c = 12 : 24 : 16**

**a : b : c = 3 : 6 : 4**

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