Question

Which pair of ratios can form a true proportion?

Answer 1

3/5 and 6/10 are a true proportion.  Just simplify the fractions and see which ones have been factored down enough to be the same. 

Answer 2

A true proportion is an equation that states that two ratios are equal.

1) The given ratios in their lowest form are:

$\frac{1}{2} and \frac{6}{10} =\frac{3}{5}$

The two ratios are not equal.

2) The given ratios in their lowest form are :

$\frac{6}{8} =\frac{3}{4} and \frac{5}{20} =\frac{1}{4}$

The two ratios are not equal.

3) The given ratios in their lowest form are :

$\frac{3}{5} and \frac{6}{10} =\frac{3}{5}$

The two ratios are equal and hence it is True proportion

4) The given ratios in their lowest form are :

$\frac{3}{9} =\frac{1}{3} and \frac{7}{80}$

The two ratios are not the same .

The third option the ratios $\frac{3}{5} and \frac{6}{10}$ are in true proportion.