Question 54

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

Solution

p is the third proportional to 3, 9.

$$\frac{p}{9}=\frac{9}{3}$$

p = 27

Let the 'n' is the fourth proportional of 6, p, 4.

n x 6 = p x 4

n x 6 = 27 x 4

n = 18

Fourth proportional of 6, p, 4 is 18.

Hence, the correct answer is Option C

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