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Business Mathematics Brief 12th Edition by Stanley Salzman ,Gary Clendenen, Charles Miller
Edition 12ISBN: 978-0132605540Business Mathematics Brief 12th Edition by Stanley Salzman ,Gary Clendenen, Charles Miller
Edition 12ISBN: 978-0132605540 Exercise 131
Explain cross products using the rules of algebra. (See Objective.)
Set up a proportion. A ratio is used to compare two numbers or amounts. A proportion says that two ratios are equal, as shown here.
A proportion can be simplified by multiplying both sides of the equation by the product of the two denominators.
Thus,
only if the cross products a • d and b • c are equal to one another. This method of cross products can be used to determine if a proportion is true.
Set up a proportion. A ratio is used to compare two numbers or amounts. A proportion says that two ratios are equal, as shown here.
A proportion can be simplified by multiplying both sides of the equation by the product of the two denominators.
Thus,
only if the cross products a • d and b • c are equal to one another. This method of cross products can be used to determine if a proportion is true.Explanation
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The product rule: 
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Business Mathematics Brief 12th Edition by Stanley Salzman ,Gary Clendenen, Charles Miller
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