1.

What is the fourth proportional to 3, 7 and 15?1. 302. 453. 354. 25

Answer» Correct Answer - Option 3 : 35

Given :

let x be the fourth proportional of  3,7 and 15 

then 3 : 7 :: 15 : x 

Concept Used:

If  a : b :: c : d

then ad = bc

d = bc/a

Calculation:

3/7 = 15/x

⇒ x = (15 × 7) / 3 

⇒ x = 35

∴ Fourth proportional of 3, 7 and 15 is 35

 

 

 

 



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