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Finding the Fourth Proportional to 426.72, 638.87 and 392.70

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Solution

The fourth proportional to 426.72, 638.87 and 392.70 is: 587.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.72 : 638.87 = 392.70 : x
  2. Step 2: Convert to fraction form
    426.72/638.87 = 392.70/x
  3. Step 3: Cross multiply
    426.72x = 638.87 × 392.70
  4. Step 4: Simplify right side
    426.72x = 250,882.29
  5. Step 5: Solve for x
    x = 250,882.29/426.72
  6. Step 6: Final answer
    x = 587.93

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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.