Final answer:
The constant of proportionality for the boy's basketball team is 13 wins per loss.
Step-by-step explanation:
The constant of proportionality represents the ratio between two quantities. In this case, the constant of proportionality represents the number of wins per loss. To find the constant of proportionality, we divide the total number of wins by the total number of losses. The boy's basketball team has won a total of 104 games and lost only 8 games. Therefore, the constant of proportionality is 104/8 = 13.