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Finding the Fourth Proportional to 276.58, 415.12 and 139.72

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Solution

The fourth proportional to 276.58, 415.12 and 139.72 is: 209.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.58 : 415.12 = 139.72 : x
  2. Step 2: Convert to fraction form
    276.58/415.12 = 139.72/x
  3. Step 3: Cross multiply
    276.58x = 415.12 × 139.72
  4. Step 4: Simplify right side
    276.58x = 58,001.20
  5. Step 5: Solve for x
    x = 58,001.20/276.58
  6. Step 6: Final answer
    x = 209.71

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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.