Answer :
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.
A true proportion is an equation that states that two ratios are equal.
1) The given ratios in their lowest form are:
[tex] \frac{1}{2} and \frac{6}{10} =\frac{3}{5} [/tex]
The two ratios are not equal.
2) The given ratios in their lowest form are :
[tex] \frac{6}{8} =\frac{3}{4} and \frac{5}{20} =\frac{1}{4} [/tex]
The two ratios are not equal.
3) The given ratios in their lowest form are :
[tex] \frac{3}{5} and \frac{6}{10} =\frac{3}{5} [/tex]
The two ratios are equal and hence it is True proportion
4) The given ratios in their lowest form are :
[tex] \frac{3}{9} =\frac{1}{3} and \frac{7}{80} [/tex]
The two ratios are not the same .
The third option the ratios [tex] \frac{3}{5} and \frac{6}{10} [/tex] are in true proportion.