Which ratios are proportional to 40 : 15?

You can consider ratios as fractions exg 1; 2 is kind of like 1/2 so

40/15

we can factor out the 'ones' (exg 4/8=1/2 times 4/4 [4/4=1])

40/15

40=2*2*2*5

15=3*5

factor out the 5

2*2*2/3

8/3

to find proptional ones just multiply the top and bottom number by the same number exg

8/3 times 4/4

8/3 times 3.14/3.14

and so on

so some are

8/3

16/6

24/9

48/18

56/21

64/29

The question is a little confusing,

For something to be proportional a constant has to be involved

E. G. A is proportional to B so A = kB

Any ratio that simplifies to 8 : 3 is the same.