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Finding the Fourth Proportional to 371.31, 557.03 and 127.86

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Solution

The fourth proportional to 371.31, 557.03 and 127.86 is: 191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.31 : 557.03 = 127.86 : x
  2. Step 2: Convert to fraction form
    371.31/557.03 = 127.86/x
  3. Step 3: Cross multiply
    371.31x = 557.03 × 127.86
  4. Step 4: Simplify right side
    371.31x = 71,221.86
  5. Step 5: Solve for x
    x = 71,221.86/371.31
  6. Step 6: Final answer
    x = 191.81

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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.