Final answer:
The ratios and proportions for scale measurements compare a model to actual distances, with consistency in units such as feet. Proportions for length and width are derived from given scale ratios, forming a mathematical representation of the scaled versus actual measurements.
Step-by-step explanation:
The question is asking about setting up ratios and proportions that compare scale distances to actual distances. Keeping units consistent is key when comparing these measurements. For the example given, the length and width ratios are compared to a unit scale to form proportions.
It is mentioned that the only unit given is in feet, which implies that the scales provided need to be in the same units. In constructing a model, it's crucial to have consistent units to accurately represent the actual size. In summary, two proportions are to be written, one each for length and width, ensuring that the ratio of the scaled measurement corresponds to the actual measurement by using feet as the common unit.