Proportions and weight on other planets

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You must use proportions to solve this problem. Find the weight of a person weighing 125 lbs. What would their weight be on mercury: Diameter: 4880 km and Mass 3.30e23 kg. Now I have been able to get the answers off an online calculator, problem is I don't know how they got the answers. The answer is 47.25, but we have to show our work and use proportions.

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@als0497,

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http://en.wikipedia.org/wiki/Gravitational_constant
$http://upload.wikimedia.org/math/0/f/3/0f36df929ac9d711a8ba8c5658c3bfee.png$
F is the magnitude of the gravitational force between the two point masses,
G is the gravitational constant,
m1 is the mass of the first point mass,
m2 is the mass of the second point mass, and
r is the distance between the two point masses.

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Proportions and weight on other planets

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