To find the constant of proportionality in the data table, we look for the ratio of hours to miles walked.
From the table:
- For 1/4 hour, 1 mile:
- For 1/2 hour, 2 miles:
- For 3/4 hour, 3 miles:
- For 1 hour, 4 miles:
The constant of proportionality is 4, meaning for every hour, Julian walks 4 miles.
Looking at the response options, the ratio (4, 1) reflects this constant of proportionality.
Therefore, the answer is:
(4, 1)