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Finding the Fourth Proportional to 809.42, 1,214.96 and 545.85

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Solution

The fourth proportional to 809.42, 1,214.96 and 545.85 is: 819.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.42 : 1,214.96 = 545.85 : x
  2. Step 2: Convert to fraction form
    809.42/1,214.96 = 545.85/x
  3. Step 3: Cross multiply
    809.42x = 1,214.96 × 545.85
  4. Step 4: Simplify right side
    809.42x = 663,185.92
  5. Step 5: Solve for x
    x = 663,185.92/809.42
  6. Step 6: Final answer
    x = 819.33

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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.