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Finding the Fourth Proportional to 381.67, 572.47 and 138.14

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Solution

The fourth proportional to 381.67, 572.47 and 138.14 is: 207.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.67 : 572.47 = 138.14 : x
  2. Step 2: Convert to fraction form
    381.67/572.47 = 138.14/x
  3. Step 3: Cross multiply
    381.67x = 572.47 × 138.14
  4. Step 4: Simplify right side
    381.67x = 79,081.01
  5. Step 5: Solve for x
    x = 79,081.01/381.67
  6. Step 6: Final answer
    x = 207.20

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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.