15. Find the mean proportional between 10 and 40?
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If x, y and z are in continued proportion then y is called the mean proportional (or geometric mean) of x and z. If y is the mean proportional of x and z, y^2 = xz, i.e., y = +√xz. If x, y and z are in continued proportion then z is called the third proportional. For example, the third proportional of 4, 8 is 16.
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32:x::x:338
32∗338=x2
10,816=x2
10816−−−−−√=x
x=104
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