Find the third proportional of 36 and 42.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 49.
Third proportional of a and b is c, such that:
a : b = b : c
So, 36 : 42 = 42 : c
⇒ c = (42 × 42) ÷ 36 = 1764 ÷ 36 = 49