Date: Part 1: Proportional Relationships in Tables This table shows the price of roses is directly proportional to the number of roses. 4*) Number of Roses 3 6 9 12 15 (y) Price (Dollars) 9 18 27 36 45 1.) What is the constant of proportionality? This means one roses costs. $ 2). Write an equation to show the relationship between the price of roses and the number of roses. I was thinking each rose cost 3 dollars but I'm not sure.