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Finding the Fourth Proportional to 267.17, 399.69 and 221.61

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Solution

The fourth proportional to 267.17, 399.69 and 221.61 is: 331.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.17 : 399.69 = 221.61 : x
  2. Step 2: Convert to fraction form
    267.17/399.69 = 221.61/x
  3. Step 3: Cross multiply
    267.17x = 399.69 × 221.61
  4. Step 4: Simplify right side
    267.17x = 88,575.30
  5. Step 5: Solve for x
    x = 88,575.30/267.17
  6. Step 6: Final answer
    x = 331.53

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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.