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Finding the Fourth Proportional to 422.20, 633.41 and 129.69

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Solution

The fourth proportional to 422.20, 633.41 and 129.69 is: 194.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.20 : 633.41 = 129.69 : x
  2. Step 2: Convert to fraction form
    422.20/633.41 = 129.69/x
  3. Step 3: Cross multiply
    422.20x = 633.41 × 129.69
  4. Step 4: Simplify right side
    422.20x = 82,146.94
  5. Step 5: Solve for x
    x = 82,146.94/422.20
  6. Step 6: Final answer
    x = 194.57

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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.