A percentage is actually a fraction with 100 in the denominator, so 75% = 75/100.
For any fraction you you can just do the division to get a decimal number. Then you can compare them:
So:
75% = 75/100 = 0.75
1/3 = 0.333...
3/8 = 0.375
0.625
Now that they're in decimal form, it's simpler to arrange them least to greatest:
0.333; 0.375; 0.625; 0;75
So in your answer, you provide the ordering of the original values:
1/3; 3/8; 0.625; 75%
This is because for example with 1/3 you lose precision because there is an infinite amount of 3's in 0.33333333333...
