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Finding the Fourth Proportional to 381, 571.17 and 137.55

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Solution

The fourth proportional to 381, 571.17 and 137.55 is: 206.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    381 : 571.17 = 137.55 : x
  2. Step 2: Convert to fraction form
    381/571.17 = 137.55/x
  3. Step 3: Cross multiply
    381x = 571.17 × 137.55
  4. Step 4: Simplify right side
    381x = 78,564.43
  5. Step 5: Solve for x
    x = 78,564.43/381
  6. Step 6: Final answer
    x = 206.21

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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.