A proportion is shown below.
7/10 = 17.5/x
What is the value of x?
Ahh -- ratios and proportions are soooo useful!
7/10 = 17.5/x
Cross multiply.
7x = 10 * 17.5
Solve for x.
7x = 175
x = 175/7
x = 25
this is how I solve, seems totally wrong.
(17.5*7)/10 = x
122.5/10 = x
12.25 = x
x = 12.25
First, you could see it's wrong. Since 7 is less than 10, then 17.5 must be less than x.
Study this site, especially Method 1 under Solutions.
http://www.regentsprep.org/Regents/math/ALGEBRA/AO3/Lprop.htm
thank you Ms.Sue :)
Oh i see, thank you for the link, that helps a lot.
You're welcome.
To find the value of x in the given proportion, we can use cross-multiplication.
First, we cross-multiply the values in the proportion:
7 * x = 10 * 17.5
Now, let's solve for x:
7x = 175
To find x, we need to isolate it. We can do this by dividing both sides of the equation by 7:
x = 175 / 7
Simplifying the right side gives us:
x = 25
Therefore, the value of x in the given proportion is 25.