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Finding the Fourth Proportional to 422.85, 634.23 and 134.25

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Solution

The fourth proportional to 422.85, 634.23 and 134.25 is: 201.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.85 : 634.23 = 134.25 : x
  2. Step 2: Convert to fraction form
    422.85/634.23 = 134.25/x
  3. Step 3: Cross multiply
    422.85x = 634.23 × 134.25
  4. Step 4: Simplify right side
    422.85x = 85,145.38
  5. Step 5: Solve for x
    x = 85,145.38/422.85
  6. Step 6: Final answer
    x = 201.36

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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.