Which proportion can we use to solve for U? During a given year, a hospital uses 258 units of blood per week to take care of 86 patients. The hospital has expanded and will be able to take care of a greater number of patients. The hospital administrator expects that they will now have 215 patients per week that will need blood. How many units of blood will the hospital need to have on hand to take care of the increased number of patients? U = the name of units of blood needed for 215 patients