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Finding the Fourth Proportional to 422.89, 634.31 and 134.30

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Solution

The fourth proportional to 422.89, 634.31 and 134.30 is: 201.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.89 : 634.31 = 134.30 : x
  2. Step 2: Convert to fraction form
    422.89/634.31 = 134.30/x
  3. Step 3: Cross multiply
    422.89x = 634.31 × 134.30
  4. Step 4: Simplify right side
    422.89x = 85,189.25
  5. Step 5: Solve for x
    x = 85,189.25/422.89
  6. Step 6: Final answer
    x = 201.45

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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.