Question

Can someone please explain proportions to me?

Answer 1

http://www.mathsisfun.com/algebra/proportions.html

This link explains what proportions are. Proportions are basically fractions or ratios that are equal to each other. For example, you have the fraction \[\frac{ 6 }{ 9 }\] You can divide both 6 and 9 by the number three. 6/3=2 and 9/3=3. So now we've reduced. \[\frac{ 2 }{ 3 }\]Since all we did was reduce 6/9, both fractions are proportional.


There's also different types of proportions. They can be set up like this. \[\frac{ 7 }{ 15 }=\frac{ x }{ 10 }\]Right now, we don't know what x equals. But we can figure that out. What you can do when you want to solve something like this, is Cross multiply and divide. What that is, is multiplying the terms across from each other, and then dividing by what's left. So in this case, we would multiply \[7\times10\]Which would equal 70, and then divide by 15, because that's the number that is left. Once I divide 70 by 15, I'll get the number that x equals. \[70\div15=4.666666667\]The 6 is repeated, but my calculator rounds it up to 7.

Answer 2

Does that make more sense now?

Answer 3

thxs

Answer 4

You're welcome :)

Answer 5

Proportion says that two ratios (or fractions) are equal.

Example:





So 1-out-of-3 is equal to 2-out-of-6



The ratios are the same, so they are in proportion.

Example: Rope

A ropes length and weight are in proportion.

When 20m of rope weighs 1kg, then:

40m of that rope weighs 2kg
200m of that rope weighs 10kg
etc.


So:

201 = 402

Answer 6

^Right, that's from the website I gave you the link for
http://www.mathsisfun.com/algebra/proportions.html