Which of the following represents a correct proportion ?

A. 12 : 9 :: 16 : 12

B. 13 : 11 :: 5 : 4

C. 30 : 45 :: 13 : 24

D. 3 : 5 :: 2 : 5

Answer: Option A

Solution(By Examveda Team)

a   :   b   ::   c   :   d
    a × d = b × c
So, go through options
(A). 9 × 16 = 12 × 12 (right)
(B). 13 × 4 = 11 × 5 (wrong)
(C). 30 × 24 = 45 × 13 (wrong)
(D). 3 × 5 = 5 × 2 (wrong)
So answer is 12 : 9 :: 16 : 12