What is the ratio of third proportional to 12 and 30 and the mean proportional between 9 and 25 is?

A. 5 : 1

B. 1 : 5

C. 5 : 2

D. 2 : 5

View Answer

1

Correct Answer :
5 : 1

Explanation :

Say A : B = 12 : 30

First, we need to find third proportion

A : B = B : C => 12 : 30 = 30 : C

=> C = 75

Next, we need to find mean proportion of 9 and 25

So, Mean Proportion (D) = √ 9 x 25 = 15

We need to find C : D

=> 75 : 15 = 5 : 1

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