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Finding the Fourth Proportional to 545.91, 819.67 and 221.91

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Solution

The fourth proportional to 545.91, 819.67 and 221.91 is: 333.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.91 : 819.67 = 221.91 : x
  2. Step 2: Convert to fraction form
    545.91/819.67 = 221.91/x
  3. Step 3: Cross multiply
    545.91x = 819.67 × 221.91
  4. Step 4: Simplify right side
    545.91x = 181,892.97
  5. Step 5: Solve for x
    x = 181,892.97/545.91
  6. Step 6: Final answer
    x = 333.19

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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.