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RRB ALP CBT I 11 Feb 2026 Shift 1 Paper

Question : 16 of 75

Marks: +1, -0

Find the mean proportional of 49 and 25.

Solution:

Concept:

Mean proportional of two numbers is the square root of their product.

Explanation:

Let the mean proportional be

x

For numbers

49

and

25

, the relation is

49 : x :: x : 25

So,

x^2 = 49 \times 25

x = \sqrt{49 \times 25}

x = \sqrt{1225}

x = 35

Answer:

The mean proportional of

49

and

25

35

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