Exams › SSC CGL (Prelims) › General

Find the ratio of: (the fourth proportional of 2, 5, 6) to (the fourth proportional of 6, 8, 9).

1. 3 : 2
2. 5 : 3
3. 3 : 4
4. 5 : 4

Correct answer: 5 : 4

Solution

Fourth proportional of 2, 5, 6: 2/5 = 6/d => d = 30/2 = 15. Fourth proportional of 6, 8, 9: 6/8 = 9/d => d = 72/6 = 12. Ratio = 15 : 12 = 5 : 4.

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