Finding the Fourth Proportional to 81,212.20, 121,818.30 and 68,381.80
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Solution
The fourth proportional to 81,212.20, 121,818.30 and 68,381.80 is: 102,572.70
Step by Step Solution
- Step 1: Write the proportion equation
81,212.20 : 121,818.30 = 68,381.80 : x - Step 2: Convert to fraction form
81,212.20/121,818.30 = 68,381.80/x - Step 3: Cross multiply
81,212.20x = 121,818.30 × 68,381.80 - Step 4: Simplify right side
81,212.20x = 8,330,154,626.94 - Step 5: Solve for x
x = 8,330,154,626.94/81,212.20 - Step 6: Final answer
x = 102,572.70
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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.