Results 1 to 2 of 2

Math Help - Proportion...

  1. #1
    Member
    Joined
    Mar 2009
    From
    jharkhand
    Posts
    77

    Proportion...

    Find the Mean Proportion:
    (a+b)* (a-b)^3 , (a+b)^3 *(a-b)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Grandad's Avatar
    Joined
    Dec 2008
    From
    South Coast of England
    Posts
    2,570
    Thanks
    1
    Hello snigdha
    Quote Originally Posted by snigdha View Post
    Find the Mean Proportion:
    (a+b)* (a-b)^3 , (a+b)^3 *(a-b)
    The Mean Proportion of two numbers is, I think, what is more usually called the Geometric Mean, and is the square root of their product. So if b is the mean proportion of a and c, then
    b^2 = ac or b = \sqrt{ac}
    So here the mean proportion is
    \sqrt{(a+b)(a-b)^3(a+b)^3(a-b)}
    =\sqrt{(a+b)^4(a-b)^4}

    =(a+b)^2(a-b)^2
    which could be written as
    =(a^2-b^2)^2
    Grandad
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Inverse proportion/Direct proportion question
    Posted in the Statistics Forum
    Replies: 3
    Last Post: September 26th 2011, 08:22 AM
  2. Proportion
    Posted in the Geometry Forum
    Replies: 1
    Last Post: December 14th 2010, 04:01 PM
  3. Proportion
    Posted in the Algebra Forum
    Replies: 3
    Last Post: November 4th 2010, 02:13 PM
  4. proportion
    Posted in the Algebra Forum
    Replies: 5
    Last Post: November 28th 2009, 10:36 AM
  5. Replies: 3
    Last Post: July 6th 2009, 08:25 PM

Search Tags


/mathhelpforum @mathhelpforum