Answer:
I'm guessing think of it like factors?
Explanation:
For example num 1. 6/18=9/27
6 and 9 both share the factors 3
18 shares factors of 6 and 9
6 x 3 = 18
9 x 2 = 18
(I'm sorry if I didn't explain right, tbh I'm not sure what the heck I am doing since I haven't done this kind of math since like 6th grade but this is the best I can think of/do.)
Hopefully this is correct and helps you? :V (I'm not even sure if i'm wording this right cz my brain hurts lol