The ratio of the third proportional to 16 & 40 and the mean proportional between 10 & 40 is: |
5 : 1 1 : 5 4 : 1 1 : 4 |
5 : 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 |