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Math Wiz ratio help
d0mino
Melbourne, Victoria
5256 posts

if I have a ratio, 7:4.039, how do I find the points where both equal whole numbers?

Is this possible?

10:09am 03/07/12 Permalink
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10:09am 03/07/12 Permalink
Tollaz0r!
Brisbane, Queensland
12860 posts
1000:577?
10:12am 03/07/12 Permalink
Strik3r
Brisbane, Queensland
2086 posts
edit: not quite what you were after.

last edited by Strik3r at 10:23:45 03/Jul/12
10:20am 03/07/12 Permalink
Strik3r
Brisbane, Queensland
2087 posts
2.5 : 0.05 (we see that the 0.05 has two decimal places so to make it a whole number we need to move the point two places to the right hand side for it to become a 5, which is a whole number).

Now we must do the same to the other side of the equation- if we take the 2.5 and move the point two places to the right hand side we seem to have a space 25? , we now fill that space with a (zero) 0 . Now that new whole number will become 250 .



Therefore now we have the equation;



250 : 5 (we can now divide both sides by 5)

250 ÷ 5 = 50

5 ÷ 5 = 1

Therefore our simplified ratio is 50 : 1

So \ (Answer) 50 : 1
10:24am 03/07/12 Permalink
thermite
Brisbane, Queensland
9840 posts
I'm no maths wiz but here's how i solved it:

7:4.039
times by 1000
7000:4039
go to a prime number calculator and check 4039, it tells me it's divisible by 7
divide by 7
1000:577
577 is a prime number
11:04am 03/07/12 Permalink
d0mino
Melbourne, Victoria
5257 posts
brill thx.
04:28pm 03/07/12 Permalink
Tollaz0r!
Brisbane, Queensland
12861 posts
Googling it was faster then writing the post..
04:46pm 03/07/12 Permalink
Dazhel
Gold Coast, Queensland
5029 posts
577 is a prime number, but it's possible to have ratios fully reduced where both sides are still non-prime. If the first part of the ratio wasn't divisible by 7 as well a prime number calculator wouldn't work.

Dividing both parts of the ratio by the greatest common divisor of 7000 and 4039 (calculator) is the way to go. The GCD in this case is 7.
05:06pm 03/07/12 Permalink
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05:06pm 03/07/12 Permalink
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