It takes Julian 1/2 hour to walk 2 miles. He decides to start walking in his spare time because he wants to make sure he has enough time to go a desired distance. He created the data table which ratio does the constant of proportionality appear.
To determine the constant of proportionality in Julian's data table, we need to look for a consistent ratio between the distance he walks and the time it takes him.
In this case, Julian walks 2 miles in 1/2 hour. To find the ratio, we divide the distance by the time:
2 miles รท 1/2 hour = 4 miles/hour
So the ratio of distance to time is 4 miles per hour. This ratio represents the constant of proportionality in Julian's data table.