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Finding the Fourth Proportional to 276.88, 415.11 and 139.86

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Solution

The fourth proportional to 276.88, 415.11 and 139.86 is: 209.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.88 : 415.11 = 139.86 : x
  2. Step 2: Convert to fraction form
    276.88/415.11 = 139.86/x
  3. Step 3: Cross multiply
    276.88x = 415.11 × 139.86
  4. Step 4: Simplify right side
    276.88x = 58,057.28
  5. Step 5: Solve for x
    x = 58,057.28/276.88
  6. Step 6: Final answer
    x = 209.68

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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.