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Finding the Fourth Proportional to 545.39, 819.94 and 542.69

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Solution

The fourth proportional to 545.39, 819.94 and 542.69 is: 815.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.39 : 819.94 = 542.69 : x
  2. Step 2: Convert to fraction form
    545.39/819.94 = 542.69/x
  3. Step 3: Cross multiply
    545.39x = 819.94 × 542.69
  4. Step 4: Simplify right side
    545.39x = 444,973.24
  5. Step 5: Solve for x
    x = 444,973.24/545.39
  6. Step 6: Final answer
    x = 815.88

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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.