Find the mean proportional between 4 and 25.
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Find the mean proportional between 4 and 25.

Find the mean proportional between 4 and 25.
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Find the mean proportional between 4 and 25.

(A) 25

(B) 10

(C) 100

(D) None of these

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SOLUTION —

Let the mean proportion be x.

Then, 4 : x :: x : 25

⇒ 4 / x = x / 25

⇒ x² = 4 × 25 = 100

∴x = √100 = 10

So, The correct option is (B)

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