Does the following table represent a proportional relationship, and if so what is the proportion of the cost for a box of cereal to the size of the box?

Cost for a box of cereal $2.20 $2.64 $3.30 $4.84
Size of box (in ounces) 10 12 15 22
yes, $0.22 per ounce
yes, $4.55 per ounce
yes, $0.44 per ounce
no it is not proportional