1. The third proportional of two numbers 9 and 15 is
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By: anil on 05 May 2019 02.09 am
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 => $$(15)^2 = 9 imes c$$ => $$c = frac{15 imes 15}{9}$$ => $$c = 5 imes 5 = 25$$ => Ans - (C)
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