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Finding the Fourth Proportional to 267.20, 402.80 and 239.36

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Solution

The fourth proportional to 267.20, 402.80 and 239.36 is: 360.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.20 : 402.80 = 239.36 : x
  2. Step 2: Convert to fraction form
    267.20/402.80 = 239.36/x
  3. Step 3: Cross multiply
    267.20x = 402.80 × 239.36
  4. Step 4: Simplify right side
    267.20x = 96,414.21
  5. Step 5: Solve for x
    x = 96,414.21/267.20
  6. Step 6: Final answer
    x = 360.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.