Finding the Fourth Proportional to 81.88, 122.80 and 52.99
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Solution
The fourth proportional to 81.88, 122.80 and 52.99 is: 79.47
Step by Step Solution
- Step 1: Write the proportion equation
81.88 : 122.80 = 52.99 : x - Step 2: Convert to fraction form
81.88/122.80 = 52.99/x - Step 3: Cross multiply
81.88x = 122.80 × 52.99 - Step 4: Simplify right side
81.88x = 6,507.17 - Step 5: Solve for x
x = 6,507.17/81.88 - Step 6: Final answer
x = 79.47
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.