Question

determine whether the ratio in each pair can form a proporition by writing each ratio in simplest form 15/45 . 3/15

Answer 1

15/45=1/3
3/15=1/5
i.e. they are not proportional

Answer 2

how do you know these things? everyone here is sooo smart

Answer 3

divide the top and bottom by the largest number that goes into both. for 15/45, 15 and 45 can be divided by 15. if you can't see that easily at least divide them both by 5, since all numbers ending in 5 are divisible by 5
15/5
----- = 3/9
45/4
now you can divide top and bottom by 3 to get 1/3
3/15 is only divisible by 3. Dividing top and bottom by 3 gives 1/5
1/5 does not equal 1/3, therefor they are not proportional.