Find the ratio between the fourth proportional of 12, 16, 6 and the third proportional of 4, 6.
Answer & explanation
Correct answer: option 4
Forth proportion to a, b , c = $\frac{b\;\times\;c}{1}$
Fourth proportion to 12, 16, 6 = \(\frac{16\; \times\; 6}{12}\)
= 8
Third proportion to a, b = $\frac{b\;\times\;b}{a}$
Third proportion to 4, 6 = \(\frac{6\; \times\; 6}{4}\)
= 9
Ratio = 8 : 9