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Interpolate monthly growth from known Annual Growth

  1. #1
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    Interpolate monthly growth from known Annual Growth

    Cross post here: http://www.mrexcel.com/forum/excel-q...al-growth.html

    Hi All,

    I have a series of values

    Jan-11 101
    Feb-11 111
    Mar-11 118
    Apr-11 135
    May-11 140
    Jun-11 149
    Jul-11 151
    Aug-11 161
    Sep-11 166
    Oct-11 175
    Nov-11 187
    Dec-11 191

    So total 2011 = 1785
    I also know that 2012 grew by 71% so there fore 2012 = 3052.35

    Now, I'd like to extrapolate 2012 monthly data to get a steady growth for 2012 which will add up to 3052.35

    So for Jan'12 it would be Dec'11*(1+X%) and then Feb'12 would be Jan'12*(1+X%)

    My question is what is this X%? I've interpolated the 71% growth to monthly as 4.57% but if I use that as my X I get 2012 = 3101.563 which is actually 2011*(1+74%) instead of 71% as I know the total to be for 2012.

    Any ideas how to find the correct X to show upward growth?

    Thanks very much for your help

    EDIT: Adding crosspost - apologies for not doing before
    Last edited by nopointing; 06-14-2014 at 07:54 PM.

  2. #2
    Administrator FDibbins's Avatar
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    Re: Interpolate monthly growth from known Annual Growth

    Your post does not comply with Rule 8 of our Forum RULES. Do not crosspost your question on multiple forums without including links here to the other threads on other forums.

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  3. #3
    Forum Guru shg's Avatar
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    2003, 2010

    Re: Interpolate monthly growth from known Annual Growth

    Entia non sunt multiplicanda sine necessitate

  4. #4
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    Excel 2010

    Re: Interpolate monthly growth from known Annual Growth

    See responses in the crossposting at http://www.mrexcel.com/forum/excel-questions/784571-interpolate-monthly-growth-known-annual-growth.html

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