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Finding the Fourth Proportional to 439.62, 663.35 and 422.74

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Solution

The fourth proportional to 439.62, 663.35 and 422.74 is: 637.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.62 : 663.35 = 422.74 : x
  2. Step 2: Convert to fraction form
    439.62/663.35 = 422.74/x
  3. Step 3: Cross multiply
    439.62x = 663.35 × 422.74
  4. Step 4: Simplify right side
    439.62x = 280,424.58
  5. Step 5: Solve for x
    x = 280,424.58/439.62
  6. Step 6: Final answer
    x = 637.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.