Finding the Fourth Proportional to 81.44, 122.18 and 80.87
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Solution
The fourth proportional to 81.44, 122.18 and 80.87 is: 121.31
Step by Step Solution
- Step 1: Write the proportion equation
81.44 : 122.18 = 80.87 : x - Step 2: Convert to fraction form
81.44/122.18 = 80.87/x - Step 3: Cross multiply
81.44x = 122.18 × 80.87 - Step 4: Simplify right side
81.44x = 9,879.68 - Step 5: Solve for x
x = 9,879.68/81.44 - Step 6: Final answer
x = 121.31
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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.