The ratio of the third proportional to 16 & 40 and the mean proportional between 10 & 40 is:
Answer & explanation
Correct answer: option 1
Third proportion to a, b = $\frac{b\; \times\; b}{a}$
Third proportion to 16, 40 = \(\frac{40\; \times\; 40}{16}\)
= 100
Mean proportion to a, b = $\sqrt{a\; \times\; b}$
Mean proportion to 10, 40 = \(\sqrt{10\; \times\;40}\)
= 20
Ratio = 100 : 20 = 5 : 1