So this is a "Challenge"

Question

(we don't have to do it but my mum is making me)
we haven't learned it, it's only if you want to do anything harder or more difficult.

1.explain why the ratios 6/9 and 8/12 are in proportion

Answer 1

reduce each. the firsts reduces to 2/3 (2*3/3*3)
the second has a common factor of 4, so it reduces also.

Answer 2

they are in proportion because

8*9 = 6*12

In a proportion

a/b = c/d

ad = bc