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Finding the Fourth Proportional to 819.35, 1,227.83 and 380.73

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Solution

The fourth proportional to 819.35, 1,227.83 and 380.73 is: 570.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.35 : 1,227.83 = 380.73 : x
  2. Step 2: Convert to fraction form
    819.35/1,227.83 = 380.73/x
  3. Step 3: Cross multiply
    819.35x = 1,227.83 × 380.73
  4. Step 4: Simplify right side
    819.35x = 467,472.88
  5. Step 5: Solve for x
    x = 467,472.88/819.35
  6. Step 6: Final answer
    x = 570.54

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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.