What is the fourth proportional to 189, 273, and 153?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 221.
Let's assume x is the fourth proportion of 189, 273, and 153.
189 : 273 :: 153 : x
⇒ 189x = 273 × 153
⇒ x = (273 × 153)/189
⇒ x = 221