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Finding the Fourth Proportional to 381.62, 572.02 and 138.08

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Solution

The fourth proportional to 381.62, 572.02 and 138.08 is: 206.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.62 : 572.02 = 138.08 : x
  2. Step 2: Convert to fraction form
    381.62/572.02 = 138.08/x
  3. Step 3: Cross multiply
    381.62x = 572.02 × 138.08
  4. Step 4: Simplify right side
    381.62x = 78,984.52
  5. Step 5: Solve for x
    x = 78,984.52/381.62
  6. Step 6: Final answer
    x = 206.97

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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.