How do I solve this word problem?

Question

The school photographs given in Ami's package are not similar in s ize. The larger photographs are 9inches x 12inches and 8inches x 10inches. If the smaller of these photos remained 10inches wide, what would the length need to be so the photos would be similar?

Answer 1

Assuming 12 is the width of the larger, the ratio of the width is 10/12 = 5/6

5/6 * ??? = 8

???? = 8*6/5 = 48/5 = 9/6

So 9.6 by 12

vs

8 by 10