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14 July, 21:01

The average of four numbers is 638.4. The first 3 are 210, 159.8, and 301.25. Find the fourth.

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  1. 14 July, 22:07
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    May be he is right but i am not sure
  2. 15 July, 00:47
    0
    (210 + 159.80 + 301.25 + x) / 4 = 638.40

    (671.05 + x) / 4 = 638.40 ... multiply both sides by 4

    671.05 + x = 638.40 * 4

    671.05 + x = 2553.6

    x = 2553.6 - 671.05

    x = 1882.55 < = = = the 4th number
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