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Finding the Fourth Proportional to 422.31, 633.57 and 129.81

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Solution

The fourth proportional to 422.31, 633.57 and 129.81 is: 194.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.31 : 633.57 = 129.81 : x
  2. Step 2: Convert to fraction form
    422.31/633.57 = 129.81/x
  3. Step 3: Cross multiply
    422.31x = 633.57 × 129.81
  4. Step 4: Simplify right side
    422.31x = 82,243.72
  5. Step 5: Solve for x
    x = 82,243.72/422.31
  6. Step 6: Final answer
    x = 194.75

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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.