the numbers are:
[tex]\frac{2}{4},\frac{1}{2},\frac{6}{12},\frac{1}{3}[/tex]so to be proportianal we cave to multiply the number for one number so the become equal so:
[tex]\frac{1}{2}\cdot\frac{2}{2}=\frac{2}{4}[/tex]and
[tex]\frac{1}{2}\cdot\frac{6}{6}=\frac{6}{12}[/tex]so the answer is D 1/3 is not proportional to the others
