Which of the following equations is not a proportion? 1.5/3=3/9 22/33=4/6 2/3=142/213 14/7=7/3.5

You can know if two fractions are proportion to another. Simply find a number that you can multiply or divide both the top and bottom of the fraction and see if you get the other fraction.

Let's check each one until we find the one that is incorrect.

1.5/3 = 3/9

Can you find a number that when divided into the top and bottom of the fraction 3/9 that will equal 1.5/3?

No you can't.

So, the first option is the answer to this question!