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Finding the Fourth Proportional to 424.86, 638.91 and 371.40

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Solution

The fourth proportional to 424.86, 638.91 and 371.40 is: 558.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.86 : 638.91 = 371.40 : x
  2. Step 2: Convert to fraction form
    424.86/638.91 = 371.40/x
  3. Step 3: Cross multiply
    424.86x = 638.91 × 371.40
  4. Step 4: Simplify right side
    424.86x = 237,291.17
  5. Step 5: Solve for x
    x = 237,291.17/424.86
  6. Step 6: Final answer
    x = 558.52

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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.