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Finding the Fourth Proportional to 404.12, 557.04 and 387.92

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Solution

The fourth proportional to 404.12, 557.04 and 387.92 is: 534.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.12 : 557.04 = 387.92 : x
  2. Step 2: Convert to fraction form
    404.12/557.04 = 387.92/x
  3. Step 3: Cross multiply
    404.12x = 557.04 × 387.92
  4. Step 4: Simplify right side
    404.12x = 216,086.96
  5. Step 5: Solve for x
    x = 216,086.96/404.12
  6. Step 6: Final answer
    x = 534.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.