Question 58

The third proportional to 9 and 15 is:

Solution

Let the third proportional to 9 and 15 be x.
9 : 15 : : 15 : x
=> $$15\times15 = 9x$$
=> $$x = \dfrac{225}{9}$$

=> $$x = 25$$
Therefore, Third proportional to 9 and 15 is 25.


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