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Finding the Fourth Proportional to 422.78, 634.20 and 179.34

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Solution

The fourth proportional to 422.78, 634.20 and 179.34 is: 269.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.78 : 634.20 = 179.34 : x
  2. Step 2: Convert to fraction form
    422.78/634.20 = 179.34/x
  3. Step 3: Cross multiply
    422.78x = 634.20 × 179.34
  4. Step 4: Simplify right side
    422.78x = 113,737.43
  5. Step 5: Solve for x
    x = 113,737.43/422.78
  6. Step 6: Final answer
    x = 269.02

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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.