
If
, then we can immediately cancel the factors of
:

Factorize the numerator and denominator:


Next, if
, then

25.5
102/4=25.5
Not really sure though
Yes, they are proportional because if you increase or decrease either amount they will both change. They will always have the same size. For example if I want to double the flour, I will have to double the milk as well because they have the same ratio.