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Finding the Fourth Proportional to 404.52, 557.70 and 287.88

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Solution

The fourth proportional to 404.52, 557.70 and 287.88 is: 396.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.52 : 557.70 = 287.88 : x
  2. Step 2: Convert to fraction form
    404.52/557.70 = 287.88/x
  3. Step 3: Cross multiply
    404.52x = 557.70 × 287.88
  4. Step 4: Simplify right side
    404.52x = 160,550.68
  5. Step 5: Solve for x
    x = 160,550.68/404.52
  6. Step 6: Final answer
    x = 396.89

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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.