The mean proportional between two numbers is 42. If one of the numbers is 31, find the other number. (Round to the nearest whole number).
57
If x is the mean proportional between a and b, then x2 = a × b.
So 422 = 31 × b, i.e. 1764 = 31b.
b = \(\frac{1764}{31}\) ≈ 56.90, which rounds to 57.
Hence, the answer is 57.
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Important Questions from Mean Proportional
- Find the mean proportional between 19 and 76.
- Find the mean proportional of 324 and 16.
- Find the mean proportional between 28 and 252.
- Find the mean proportional of 400 and 4.
- Find the mean proportional of 225 and 4.
