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Finding the Fourth Proportional to 371.55, 557.11 and 127.95

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Solution

The fourth proportional to 371.55, 557.11 and 127.95 is: 191.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.55 : 557.11 = 127.95 : x
  2. Step 2: Convert to fraction form
    371.55/557.11 = 127.95/x
  3. Step 3: Cross multiply
    371.55x = 557.11 × 127.95
  4. Step 4: Simplify right side
    371.55x = 71,282.22
  5. Step 5: Solve for x
    x = 71,282.22/371.55
  6. Step 6: Final answer
    x = 191.85

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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.