Finding the Fourth Proportional to 84.24, 126.19 and 81.18
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Solution
The fourth proportional to 84.24, 126.19 and 81.18 is: 121.61
Step by Step Solution
- Step 1: Write the proportion equation
84.24 : 126.19 = 81.18 : x - Step 2: Convert to fraction form
84.24/126.19 = 81.18/x - Step 3: Cross multiply
84.24x = 126.19 × 81.18 - Step 4: Simplify right side
84.24x = 10,243.70 - Step 5: Solve for x
x = 10,243.70/84.24 - Step 6: Final answer
x = 121.61
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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.