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Finding the Fourth Proportional to 819.46, 1,229.20 and 545.50

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Solution

The fourth proportional to 819.46, 1,229.20 and 545.50 is: 818.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.46 : 1,229.20 = 545.50 : x
  2. Step 2: Convert to fraction form
    819.46/1,229.20 = 545.50/x
  3. Step 3: Cross multiply
    819.46x = 1,229.20 × 545.50
  4. Step 4: Simplify right side
    819.46x = 670,528.60
  5. Step 5: Solve for x
    x = 670,528.60/819.46
  6. Step 6: Final answer
    x = 818.26

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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.