Let's first work out if A (1) x D (6) is equal to B (3) x C (2):
As we can see, 6 does equal 6 so we can say that 1/3 and 2/6 are proportional.
Let's also try this by reducing the two fractions/ratios down to their lowest terms and see if the resulting ratio is equal.
By reducing the two ratios down to their simplest/lowest form we can see that the simplest form of 1/3 is 1/3 and the simplest form of 2/6 is 1/3, so 1/3 and 2/6 are proportional to each other.
That's all there is to it when comparing 1/3 and 2/6 to see if the ratios are proportional. The easiest method is to make sure the product of the "means" is equal to the product of the "extremes" by multiplying A and D and B and C to make the resulting number matches.
therefore,their proportion is 1/3
