Find the fourth proportional to the numbers 5, 7, 30. – InterviewSolution

1.

Find the fourth proportional to the numbers 5, 7, 30.

Answer»

Let the fourth number be x

Then,

= 5: 7:: 30: x

We know that,

Product of extremes = product of means

∴ 5 × x = 7 × 30

= 5x = 210

= x = 210/5

= x = 42

Hence, x = 42

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