Question 58

What is the fourth proportional to 3, 7 and 15?

Solution

Let the fourth proportional be x.
$$3 : 7 :: 15 : x$$
$$15\times7 = 3\times x$$
=> $$x = \dfrac{105}{3} = 35$$
Therefore, The fourth proportional to 3, 7 and 15 is 35.

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SSC GD 6th March 2019 Shift-1

What is the fourth proportional to 3, 7 and 15?

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