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Finding the Fourth Proportional to 819.48, 1,229.66 and 545.70

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Solution

The fourth proportional to 819.48, 1,229.66 and 545.70 is: 818.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.48 : 1,229.66 = 545.70 : x
  2. Step 2: Convert to fraction form
    819.48/1,229.66 = 545.70/x
  3. Step 3: Cross multiply
    819.48x = 1,229.66 × 545.70
  4. Step 4: Simplify right side
    819.48x = 671,022.73
  5. Step 5: Solve for x
    x = 671,022.73/819.48
  6. Step 6: Final answer
    x = 818.84

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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.