fascinated by ocean life, hunter wants to put a saltwater aquarium in his bedroom. he needs to make sure he buys a big enough tank to grow his collection of fish over time. there is a proportional relationship between the number of fish in hunter's collection, x, and the smallest tank size (in gallons), y, he needs to safely keep his fish. x (fish) y (gallons) 1 22 2 44 3 66 4 88 what is the constant of proportionality? write your answer as a whole number or decimal.