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Finding the Fourth Proportional to 422.74, 633.31 and 285.55

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Solution

The fourth proportional to 422.74, 633.31 and 285.55 is: 427.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.74 : 633.31 = 285.55 : x
  2. Step 2: Convert to fraction form
    422.74/633.31 = 285.55/x
  3. Step 3: Cross multiply
    422.74x = 633.31 × 285.55
  4. Step 4: Simplify right side
    422.74x = 180,839.37
  5. Step 5: Solve for x
    x = 180,839.37/422.74
  6. Step 6: Final answer
    x = 427.78

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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.