Which of the following is not a proportion?

1/4 = 3/12
4/10 = 12/20
2/4 = 3/6
8/6 = 20/15

Hiya there! :D The answer to your question is 4/10= 12/20. That is NOT A PROPORTION. Anyways I just did for the first one 1*3=3 and 4*3= 12 which is 3/12. Next 4/10= 12/20. Nope you can't do that. 4/10= 0.40 and 12/20= 0.60 those are not the same.2/4= 3/6 those both equal 1/2. You can simplify them and make them 1/2 and they are the same! They both equal to 1/2 and 0.50. Last but not least 8/6= 20/15. 8/6= 1.333333 and 20/15= 1.3333333. So yeah that's how I got my answers! ;D

Hope I helped! Have a nice day! ;) :D :)