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Finding the Fourth Proportional to 422.89, 634.02 and 285.55

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Solution

The fourth proportional to 422.89, 634.02 and 285.55 is: 428.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.89 : 634.02 = 285.55 : x
  2. Step 2: Convert to fraction form
    422.89/634.02 = 285.55/x
  3. Step 3: Cross multiply
    422.89x = 634.02 × 285.55
  4. Step 4: Simplify right side
    422.89x = 181,044.41
  5. Step 5: Solve for x
    x = 181,044.41/422.89
  6. Step 6: Final answer
    x = 428.11

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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.