Which of the following is a proportion?

1. 2/8 = 3/12

2. 2/3 = 4/9

3. 3/5 = 6/15

4. 4/7 = 2/14

2/8=3/12

The reason for this is because the other answers are not proportionate between both numerator and denominator. All of them except for 2/8=3/12 are multiplied by different numbers for both the numerator and denominator.