Who is asking: Student
There are many examples for ratios and proportions in real life such as:
There has been a recent study of the use of proportion in Nursing - calculating doses of drugs, and how to dilute them for different people (where the dosage is by weight, or by stage of the treatement).
One of the interesting things was HOW the practicing nurses computed proportions etc. Not the text book way at all! There is a note on this stude called Proportional Reasoning by Nurses on the Mathematical Association of America Web site.Leeanne and Walter