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Finding the Fourth Proportional to 381.42, 572.17 and 137.91

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Solution

The fourth proportional to 381.42, 572.17 and 137.91 is: 206.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.42 : 572.17 = 137.91 : x
  2. Step 2: Convert to fraction form
    381.42/572.17 = 137.91/x
  3. Step 3: Cross multiply
    381.42x = 572.17 × 137.91
  4. Step 4: Simplify right side
    381.42x = 78,907.96
  5. Step 5: Solve for x
    x = 78,907.96/381.42
  6. Step 6: Final answer
    x = 206.88

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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.