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Math Help - Ratios and scales

  1. #1
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    Ratios and scales

    The earth's diameter is about 13,000 km. If a globe has a diameter of 0.5 m write the globe scale as a ratio. What distance on earth would 1 centimeter on the globe represent?

    Any help would be greatly appreciated. Thanks
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  2. #2
    Senior Member I-Think's Avatar
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    The ratio is 13000km:0.5m

    Convert to one unit of measurement, we shall use centimeters
    So multiply by

    1,300,000,000cm:500cm

    Divide both sides by 500 to get it down to 1cm

    2,600,000cm:1cm

    So one cm on the globe represents 26km on the earth
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  3. #3
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    Thanks so much

    I-Think, thanks so much for the help. I was forgetting to convert the m to cm. Great explanation as well
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