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Finding the Fourth Proportional to 422.85, 634.24 and 114.74

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Solution

The fourth proportional to 422.85, 634.24 and 114.74 is: 172.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.85 : 634.24 = 114.74 : x
  2. Step 2: Convert to fraction form
    422.85/634.24 = 114.74/x
  3. Step 3: Cross multiply
    422.85x = 634.24 × 114.74
  4. Step 4: Simplify right side
    422.85x = 72,772.70
  5. Step 5: Solve for x
    x = 72,772.70/422.85
  6. Step 6: Final answer
    x = 172.10

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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.