# Thread: using ratio to find a number

1. ## using ratio to find a number

Hi everyone,

First post. Can't figure this out. It's been awhile.

Anyhow, here we go:

if 29 is to 11438

and

-14 is to 11417

what is 0 equivalent to?

2. Originally Posted by amedhussaini
Hi everyone,

First post. Can't figure this out. It's been awhile.

Anyhow, here we go:

if 29 is to 11438

and

-14 is to 11417

what is 0 equivalent to?

If $\frac{29}{11438} \ \ and \ \ -\frac{14}{11417}$, then what is 0 equivalent to??

I'm not sure what it is you're actually trying to find. What does 0 have to do with the two ratios you wrote?

3. ## Hello

Hi Masters,

The 0 is a zero line. Values are assigned based on certain criteria.

In 1 step forward, 29 is equal to 11438. In the next step forward, -14 is equal to 11417. I'm trying to find what the zero line is equivalent to.

(this is for an automated stock trading system I'm working on)

Thanks..

4. If no other restrictions are given, then I assume the curve containing the 11438 and 11417 is linear or a straight line.

Draw the figure.
On a (x,y) set of axes, plot the two given points (-14,11417) and (29,11438).
The idea is to get the y-coordinate when x = 0.

Draw the horizontal line y = 11417.

A right triangle is formed whose
>>>vertical leg is (11438 -11417) = 21
>>>horizontal leg is (14 +29) = 43
>>>hypotenuse is unknown

Let c = vertical line segment along the y-axis, or x=0, from the hypotenuse to the horizontal leg.

By proportion,
c/14 = 21/43
c = 14*21/43 = 6.8372

Therefore, 0 is to (11417 +6.8372) = 11423.8372 ------answer.

Umm, I think you should have said "28 is to 11438". Not the posted 29.
Because if it were 28. then
c = 14*21/42 = 7
and then 0 is to 11424 ------**

5. Very enlightening post, thank you. I will apply the principles you outlined.

Thank you very much, Ticbol.

6. Are you sure that this is just a straight line problem?
May be there is a coding that maps $29\to11438$ and $-14\to11417$, and asks what $0$ should be under this coding?