How do you do proportional determination?

Proportional determination involves finding the relationship between two quantities to maintain a constant ratio. This can be done by setting up a proportion, typically in the form of a/b = c/d, where a and b are one pair of quantities, and c and d are another pair. Cross-multiplication helps to solve for the unknown variable. This method is commonly used in various applications, such as scaling, recipe adjustments, and financial calculations.