The constant of proportionality in a relationship refers to the ratio between two quantities that are directly proportional to each other. If you are looking for the constant of proportionality in terms of tomato slices per slice of cheese, you would need specific amounts of tomato slices and cheese slices to determine the ratio.
If, for instance, you have \( x \) slices of cheese and \( y \) slices of tomatoes, the constant of proportionality \( k \) can be expressed as:
\[ k = \frac{y}{x} \]
This means that for every slice of cheese, you have \( k \) slices of tomato. If you provide specific numbers of tomato slices and cheese slices, I can help compute the exact constant of proportionality for you.