RRB NTPC · Question 12
Find the fourth proportional to 12, 18, 20.
Show answer & explanation
Answer: (A) 30
Explanation
The fourth proportional x satisfies 12 : 18 = 20 : x, so x = 18 × 20/12 = 30.
Railways PYQCBT 2 2017
RRB NTPC · Question 12
Answer: (A) 30
The fourth proportional x satisfies 12 : 18 = 20 : x, so x = 18 × 20/12 = 30.