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Finding the Fourth Proportional to 381.56, 572.00 and 138.05

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Solution

The fourth proportional to 381.56, 572.00 and 138.05 is: 206.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.56 : 572.00 = 138.05 : x
  2. Step 2: Convert to fraction form
    381.56/572.00 = 138.05/x
  3. Step 3: Cross multiply
    381.56x = 572.00 × 138.05
  4. Step 4: Simplify right side
    381.56x = 78,961.05
  5. Step 5: Solve for x
    x = 78,961.05/381.56
  6. Step 6: Final answer
    x = 206.95

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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.