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Finding the Fourth Proportional to 372.15, 557.87 and 128.61

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Solution

The fourth proportional to 372.15, 557.87 and 128.61 is: 192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.15 : 557.87 = 128.61 : x
  2. Step 2: Convert to fraction form
    372.15/557.87 = 128.61/x
  3. Step 3: Cross multiply
    372.15x = 557.87 × 128.61
  4. Step 4: Simplify right side
    372.15x = 71,747.02
  5. Step 5: Solve for x
    x = 71,747.02/372.15
  6. Step 6: Final answer
    x = 192.79

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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.