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Example 6.47 from Prealgebra, 6.5 Solve Proportions and their Applications
Solve Proportions and their Applications: example 6.47
Josiah went to Mexico for spring break and changed dollars into Mexican pesos. At that time, the exchange rate had U.S. is equal to Mexican pesos. How many Mexican pesos did he get for his trip?
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
Identify what you are asked to find. How many Mexican pesos did Josiah get? Choose a variable to represent it. Let number of pesos. Write a sentence that gives the information to find it. If $1 U.S. is equal to 12.54 Mexican pesos, then $325 is how many pesos? Translate into a proportion. Substitute given values. The variable is in the denominator, so find the cross products and set them equal. Simplify. Check if the answer is reasonable. Yes, $100 would be $1,254 pesos. $325 is a little more than 3 times this amount. Write a complete sentence. Josiah has 4075.5 pesos for his spring break trip.
Your turn
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Yurianna is going to Europe and wants to change dollars into Euros. At the current exchange rate, US is equal to Euro. How many Euros will she have for her trip?
How did it go?