Question

Find the fourth proportion of the numbers $\frac{1}{3}rd of 15,\frac{4}{5}th of 25,\frac{3}{7}th of 35$

• A. 65
• B. 55
• C. 60
• D. 50

Answer 1

Answer:

C. 60

Solution:

Given:

Concept used:

If a : b :: c : d then,

fourth proportional (d) = (b × c)/a

Calculation:

5 : 20 : : 15 : x

⇒ x = (20 × 15)/5 

⇒ x = 60

∴ The correct answer is 60.