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Finding the Fourth Proportional to 381.93, 572.97 and 138.48

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Solution

The fourth proportional to 381.93, 572.97 and 138.48 is: 207.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.93 : 572.97 = 138.48 : x
  2. Step 2: Convert to fraction form
    381.93/572.97 = 138.48/x
  3. Step 3: Cross multiply
    381.93x = 572.97 × 138.48
  4. Step 4: Simplify right side
    381.93x = 79,343.26
  5. Step 5: Solve for x
    x = 79,343.26/381.93
  6. Step 6: Final answer
    x = 207.74

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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.