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Finding the Fourth Proportional to 404.28, 558.01 and 391.31

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Solution

The fourth proportional to 404.28, 558.01 and 391.31 is: 540.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.28 : 558.01 = 391.31 : x
  2. Step 2: Convert to fraction form
    404.28/558.01 = 391.31/x
  3. Step 3: Cross multiply
    404.28x = 558.01 × 391.31
  4. Step 4: Simplify right side
    404.28x = 218,350.48
  5. Step 5: Solve for x
    x = 218,350.48/404.28
  6. Step 6: Final answer
    x = 540.10

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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.