Question 731543: if x and y are relatated, is it true that if i add 3 to x and 3 to y, they are proportional?
Answer by Simnepi(216)   (Show Source):
You can put this solution on YOUR website! No!
to keep quantities in proportion you must multiply NOT add.
E.g.
1:2, 2:4, 3:6, 4:8, 5:10, etc. these are all in the same proportion
consider 1:2
if you add 3 to each quantity you get 4:5 which is not in the correct proportion
if you multiply them both by 3 you get 3:6 which is in the same proportion.
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