To find the constant of proportionality between earnings and time in hours, we can use the formula:
Constant of proportionality = Earnings / Time
Using the given data:
Earnings (dollars): $451.80, $577.30, $727.90
Time (hours): 18, 23, 29
Let's calculate the constant of proportionality for each pair of earnings and time:
For the first pair:
Constant of proportionality = $451.80 / 18 = $25.10
For the second pair:
Constant of proportionality = $577.30 / 23 = $25.10
For the third pair:
Constant of proportionality = $727.90 / 29 = $25.10
We observe that the constant of proportionality between earnings and time in hours is the same for all the data points, which is $25.10.
Therefore, the constant of proportionality between earnings and time in hours is $25.10.
