Find the ratio of mean proportion of 9 and 49 to the 4th proportion of 3, 5 and 9.
Answer & explanation
Correct answer: option 3
Mean proportion ⇒ \(\sqrt{9×49}=\sqrt{441}\) = 21
Fourth proportion(x) ⇒ \(\frac{3 }{5}\) = \(\frac{9 }{x}\) ⇒ x = 15
Req. Ratio = 21 : 15 = 7 : 5