Question

If the third proportion to 9 and x is 36, find the value of x.
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Answer 1

Answer:

Basically, 9,x,36 are in continued proportion.

Or 9,x,x,36 are in proportion.

Now product of means = product of extremes.

So, x² = 36 * 9

or x = 6 * 3 = 18.  Ans.