RRB NTPC · Question 38
What is the fourth proportional to 15, 12 and 20.
Show answer & explanation
Answer: (D) 16
Explanation
The fourth proportional x satisfies 15 : 12 = 20 : x, so x = 12 × 20/15 = 16.
Railways PYQCBT 2 2017
RRB NTPC · Question 38
Answer: (D) 16
The fourth proportional x satisfies 15 : 12 = 20 : x, so x = 12 × 20/15 = 16.