Dealing with Ratios

In class 3/8/11, the class did not have much notes to take. We actually did more hands on and actual practicing with ratios. Ratio is a pair of numbers that are used to compare two sets. Ratio can be written in various forms such as a fraction or using a colon. For example we used to number of males to females in the class and the results ended up as following. We have a total of 20 people in class today, 6 are male and 14 and female; the way to properly write this as a ratio is either 6/14 or 6:14 number of males to females. Ratios are used in alot of everyday things from your T.V ratio to Miles per gallon. Anytime given a question on percent; key rule of thumb is that it is any number over 100, and it is written like 4% , meaning 4/100.Below is a link to a site to seek for more practice with ratios.
http://www.math.com/school/subject1/lessons/S1U2L1GL.html

(Ratios of widescreen to regular spectrum)

( This picture illustrates 23miles:1 gallon)

We also touched base on Proportions which ties in with Ratios; for any two ratios a/b and c/d, the equation is called a proportion. Proportions are typically used in  trying to solve a problem, such as you are given a,b,d and you have to figure out what c is? The easiest way to figure out that number is my using cross multiplication  once you have your proportion set up with the (X) to be solved. you can check your answer then by just simply plugging into the original problem and justifying if it is a positive fit.