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Finding the Fourth Proportional to 422.92, 632.70 and 285.28

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Solution

The fourth proportional to 422.92, 632.70 and 285.28 is: 426.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.92 : 632.70 = 285.28 : x
  2. Step 2: Convert to fraction form
    422.92/632.70 = 285.28/x
  3. Step 3: Cross multiply
    422.92x = 632.70 × 285.28
  4. Step 4: Simplify right side
    422.92x = 180,496.66
  5. Step 5: Solve for x
    x = 180,496.66/422.92
  6. Step 6: Final answer
    x = 426.79

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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.