Which of the paired items from the pet store can be used to create a proportion? 3 cans of tuna for $4.50 and 5 cans of chicken for $6 2 cans of beef for $5 and 6 cans of shrimp for $15.25 5 deluxe meals for $4.75 and 10 premium meals for $9 4 cans of salmon for $9 and 6 cans of chicken for $13.50

This is asking which 2 paired items have the same fractional ratio I believe. So all we have to do is make ratios of price to item amount and see if they are equal.
1. 4.5/3 = 6/5
this one we divide numerator and denominator of left side by 1.5 and get:
3/2 = 6/5
this is not true so wrong

2. 5/2 = 15.25/6
2.5 = 2.5416666
sometimes easier to use calculator then reduce. But not equal so wrong.

3. 4.75/5 = 9/10
95/100 = 9/10
wrong

4. 9/4 = 13.5/ 6
4.5/2 =4.5/2
this one is equal