Solution
Three numbers a,b,c are in proportion iff $$b^2 = ac$$ where $$b$$ is the mean proportion and $$c$$ is the third proportion
The given numbers are 9 and 15
=> $$(15)^2 = 9 \times c$$
=> $$c = \frac{15 \times 15}{9}$$
=> $$c = 5 \times 5 = 25$$
=> Ans - (C)
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