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Finding the Fourth Proportional to 429.28, 644.20 and 267.08

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Solution

The fourth proportional to 429.28, 644.20 and 267.08 is: 400.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.28 : 644.20 = 267.08 : x
  2. Step 2: Convert to fraction form
    429.28/644.20 = 267.08/x
  3. Step 3: Cross multiply
    429.28x = 644.20 × 267.08
  4. Step 4: Simplify right side
    429.28x = 172,052.94
  5. Step 5: Solve for x
    x = 172,052.94/429.28
  6. Step 6: Final answer
    x = 400.79

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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.