oook that site didn't help much I don't need to know how to suck up to my teacher. I need to know how to set up a ratio, can someone help me??
The format for ratios is # : # :: # : #
Example 1: 2 :: 2 : ?
1 is one half of 2... so 2 would be one half of ? Four , of course.
Chrissy, here is an excellent site on how to set up ratios.
http://cstl.syr.edu/FIPSE/Decunit/ratios/ratios.htm
thank you ok that sounded simple. but is it always one half of a number or..can you give me an example or a problem and solve it out???
oooo thanks for the site. it will help me alot!
I'm sorry, the site I thought I posted wasn't the same one that was posted.
GuruBlue has given you an excellent site.
The problem you had stated that 2 inches on the blueprint equals 5 feet in the actual room. The problem asks the length of the actual measurement when it's 7 1/2 inches long on the blueprint. Here's the ratio I set up:
2 inches is to 5 feet as 7 1/2 inches is to x (the actual length).
This is shown as:
2 / 5 as 7 1/2 / x
We cross multiply the top of the first fraction with the bottom of the second fraction.
2x = 5 (7 1/2)
2x = 37.5
x = 18.75 = 18 3/4
To set up a ratio, you need to compare two quantities or values. The basic format for a ratio is # : #, where the first number represents one quantity and the second number represents another quantity. For example, if you want to set up a ratio for the number of apples to oranges, you could write it as 4 : 3.
When solving a ratio problem, it might not always be one half of a number. The specific values in the ratio will depend on the problem or situation you are working with. Let's go through an example to illustrate this.
Suppose you have a blueprint of a room where 2 inches on the blueprint equals 5 feet in the actual room. Now, you want to find out the length of an object on the blueprint when it measures 7 1/2 inches.
To set up the ratio, you can use the information given: 2 inches is to 5 feet as 7 1/2 inches is to x (the actual length). It can be written as:
2 / 5 = 7 1/2 / x
To solve for x, you cross multiply by multiplying the top of the first fraction by the bottom of the second fraction:
2x = 5 * (7 1/2)
To simplify, you convert the mixed number to an improper fraction:
2x = 5 * (15/2)
Next, perform the multiplication:
2x = 75/2
Finally, solve for x by dividing both sides of the equation by 2:
x = (75/2) / 2
x = 75/4
This fraction can also be written as a mixed number:
x = 18 3/4
So, when the length on the blueprint measures 7 1/2 inches, the actual length is 18 3/4 units.
I apologize for the confusion with the previous website suggestion. If you need further assistance or have more questions, feel free to ask.