The ratio of the two ratios is 3 / 2. The external terms of the formula are 1 / 4 and 1 / 9 respectively. The ratio is (): () = (): ()

The ratio of the two ratios is 3 / 2. The external terms of the formula are 1 / 4 and 1 / 9 respectively. The ratio is (): () = (): ()

The ratio is (1 / 4): (1 / 6) = (1 / 6): (1 / 9)