Finding the Fourth Proportional to 81.99, 113.08 and 63.53
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Solution
The fourth proportional to 81.99, 113.08 and 63.53 is: 87.62
Step by Step Solution
- Step 1: Write the proportion equation
81.99 : 113.08 = 63.53 : x - Step 2: Convert to fraction form
81.99/113.08 = 63.53/x - Step 3: Cross multiply
81.99x = 113.08 × 63.53 - Step 4: Simplify right side
81.99x = 7,183.97 - Step 5: Solve for x
x = 7,183.97/81.99 - Step 6: Final answer
x = 87.62
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.