Chapter 2: Problem 5
Write a proportion and answer each question using the conversion factor 1 inch \(=2.54\) centimeters. a. A teacher is \(62.5\) inches tall. How many centimeters tall is she? (a) b. A common ceiling height is 96 inches ( 8 feet). About how high is this in centimeters? c. The diameter of a CD is 12 centimeters. What is its diameter in inches? (a) d. The radius of a typical soda can is \(3.25\) centimeters. What is its radius in inches?
Short Answer
Step by step solution
Understanding the Conversion
Write a Proportion for Part (a)
Solve the Proportion for Part (a)
Write a Proportion for Part (b)
Solve the Proportion for Part (b)
Write a Proportion for Part (c)
Solve the Proportion for Part (c)
Write a Proportion for Part (d)
Solve the Proportion for Part (d)
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Proportion Solving in Measurement Conversions
- Left side: The known conversion factor, \( \frac{1 \text{ inch}}{2.54 \text{ cm}} \).
- Right side: The ratio of the measurement you want to convert, \( \frac{62.5 \text{ inches}}{x \text{ cm}} \).
The Magic of Measurement Conversions
- If you're moving from inches to centimeters, multiply the inches by 2.54.
- If going from centimeters to inches, divide the centimeters by 2.54.
Understanding Cross-Multiplication in Proportions
- Identify your two fractions. With the specific example, it might be \( \frac{1 \text{ inch}}{2.54 \text{ cm}} = \frac{62.5 \text{ inches}}{x \text{ cm}} \).
- Cross-multiply: Multiply across the equals sign. This means \( 1 \cdot x = 2.54 \cdot 62.5 \).