Final answer:
The constant of proportionality is 4.6.
Step-by-step explanation:
To find the constant of proportionality, we need to solve the equation 115 = k(25) for k. We can do this by dividing both sides of the equation by 25:
115/25 = k(25)/25
4.6 = k
So, the constant of proportionality is 4.6.