I need extra help in ratio and proportion. I would appreciate if you write back with examples. I'm not sure what kind of examples of ratios you were thinking of, but I'll throw out a few for you to think about. Putting two numbers in a ratio gives you a sense of the relative sizes of two numbers. That means 200 is twice the size of 100.
Proportionality is very related to ratios.
I hope this helps answer your question. Please feel free to write back if you have any other questions.