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SSC CGL 2021 PYQ — Question 72

SSC CGL - 24 Aug 2021 - Shift 1 • Quantitative Aptitude • Q72

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If p is the third proportional to 3, 9, then what is the fourth proportional to 6, p, 4 ?

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 18

p is the third proportional to 3, 9

3 : 9 :: 9 : p

3p = 81

p = 27.

Let the fourth proportional be x.

6 : 27 : : 4 : x.

6x = 27 × 4

x = 18.