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Finding the Fourth Proportional to 422.21, 634.02 and 260.92

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Solution

The fourth proportional to 422.21, 634.02 and 260.92 is: 391.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.21 : 634.02 = 260.92 : x
  2. Step 2: Convert to fraction form
    422.21/634.02 = 260.92/x
  3. Step 3: Cross multiply
    422.21x = 634.02 × 260.92
  4. Step 4: Simplify right side
    422.21x = 165,427.48
  5. Step 5: Solve for x
    x = 165,427.48/422.21
  6. Step 6: Final answer
    x = 391.81

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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.