Finding the Fourth Proportional to 88.20, 121.68 and 81.18
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Solution
The fourth proportional to 88.20, 121.68 and 81.18 is: 112.00
Step by Step Solution
- Step 1: Write the proportion equation
88.20 : 121.68 = 81.18 : x - Step 2: Convert to fraction form
88.20/121.68 = 81.18/x - Step 3: Cross multiply
88.20x = 121.68 × 81.18 - Step 4: Simplify right side
88.20x = 9,877.98 - Step 5: Solve for x
x = 9,877.98/88.20 - Step 6: Final answer
x = 112.00
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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.