Question

Find the number that makes the ratio equivalent 1:5 9:

Answer 1

45,

because if 1 is proportional to 9, 1 had to be multiplied by 9, so you have to mltiply 5 by 9 to get 45. if 9:45 is simplified by dividing both by 9, you'll see that the ratio becomes 1:5 again. They are equivalent