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Finding the Fourth Proportional to 819.62, 1,228.48 and 356.92

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Solution

The fourth proportional to 819.62, 1,228.48 and 356.92 is: 534.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.62 : 1,228.48 = 356.92 : x
  2. Step 2: Convert to fraction form
    819.62/1,228.48 = 356.92/x
  3. Step 3: Cross multiply
    819.62x = 1,228.48 × 356.92
  4. Step 4: Simplify right side
    819.62x = 438,469.08
  5. Step 5: Solve for x
    x = 438,469.08/819.62
  6. Step 6: Final answer
    x = 534.97

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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.