NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 14

Find the fourth proportional to 3.6, 6.9, and 11.4. A. 20.3 B. 18.9 C. 19.6 D. 21.85

  1. B

  2. A

  3. D

  4. C

Show answer & explanation

Answer: (C) D

Explanation

The fourth proportional x satisfies 3.6 : 6.9 = 11.4 : x. So x = 6.9 × 11.4/3.6 = 78.66/3.6 = 21.85.