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Finding the Fourth Proportional to 381.34, 572.04 and 137.80

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Solution

The fourth proportional to 381.34, 572.04 and 137.80 is: 206.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.34 : 572.04 = 137.80 : x
  2. Step 2: Convert to fraction form
    381.34/572.04 = 137.80/x
  3. Step 3: Cross multiply
    381.34x = 572.04 × 137.80
  4. Step 4: Simplify right side
    381.34x = 78,827.11
  5. Step 5: Solve for x
    x = 78,827.11/381.34
  6. Step 6: Final answer
    x = 206.71

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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.