Final answer:
The constant of proportionality in the equation y = 7.25x is 7.25.
Step-by-step explanation:
The constant of proportionality in the equation y = 7.25x is 7.25. In this equation, x represents the independent variable and y represents the dependent variable. The constant of proportionality is the factor by which the dependent variable changes when the independent variable changes by one unit. In this case, for every one unit increase in x, y increases by 7.25 units.