The ratio of the mean proportional between 0.7 and 2.8 and the third proportional to 2.5 and 3.5 is:
Mean proportional between 0.7 and 2.8Â = $$\sqrt{0.7\times2.8}=1.4$$
Let third proportional to 2.5 and 3.5Â be $$x$$
=> $$\frac{2.5}{3.5}=\frac{3.5}{x}$$
=> $$x=\frac{3.5\times3.5}{2.5}=4.9$$
$$\therefore$$ Required ratio = $$\frac{1.4}{4.9}=2:7$$
=> Ans - (B)
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