Final answer:
In the equation m = 4b, the constant of proportionality that represents the time it takes to cook a number of bacon cheeseburgers is 4.
Step-by-step explanation:
The constant of proportionality in the equation m = 4b, is the factor by which the number of bacon cheeseburgers (b) is multiplied to give the time in minutes (m). In this equation, the constant of proportionality is simply the coefficient of b, which is 4. Hence, for every bacon cheeseburger made, it takes 4 minutes of cooking time. Here, the constant of proportionality is the ratio of time per cheeseburger, which can be written as m/b or 4/1.