The provided table shows the relationship between the number of scoops of raspberries and the corresponding cups of lemonade. Let's analyze the data:
\[
\begin{array}{|c|c|}
\hline
\text{Raspberries (scoops)} & \text{Lemonade (cups)} \
\hline
1 & 2.5 \
2 & 5 \
4 & 10 \
6 & 15 \
\hline
\end{array}
\]
To find the constant of proportionality, we can determine the ratio of raspberries to lemonade for each pair:
-
For 1 scoop of raspberries and 2.5 cups of lemonade:
\[
\text{Ratio} = \frac{1}{2.5} = \frac{1}{\frac{5}{2}} = \frac{1 \cdot 2}{5} = \frac{2}{5}
\]
-
For 2 scoops of raspberries and 5 cups of lemonade:
\[
\text{Ratio} = \frac{2}{5}
\]
-
For 4 scoops of raspberries and 10 cups of lemonade:
\[
\text{Ratio} = \frac{4}{10} = \frac{2}{5}
\]
-
For 6 scoops of raspberries and 15 cups of lemonade:
\[
\text{Ratio} = \frac{6}{15} = \frac{2}{5}
\]
In each case, the ratio of raspberries to lemonade is consistently \(\frac{2}{5}\). This confirms that the constant of proportionality in this relationship is \(\frac{2}{5}\).
This means for every 5 cups of lemonade, Rose consistently adds 2 scoops of raspberries, reflecting a proportional relationship.