7th Grade Math

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A proportion is shown below.

7/10 = 17.5/x

What is the value of x?

  • 7th Grade Math -

    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

  • 7th Grade Math -

    this is how I solve, seems totally wrong.

    (17.5*7)/10 = x

    122.5/10 = x

    12.25 = x

    x = 12.25

  • 7th Grade Math -

    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

  • 7th Grade Math -

    thank you Ms.Sue :)

  • 7th Grade Math -

    Oh i see, thank you for the link, that helps a lot.

  • 7th Grade Math -

    You're welcome.

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