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Finding the Fourth Proportional to 425.82, 638.43 and 220.29

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Solution

The fourth proportional to 425.82, 638.43 and 220.29 is: 330.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.82 : 638.43 = 220.29 : x
  2. Step 2: Convert to fraction form
    425.82/638.43 = 220.29/x
  3. Step 3: Cross multiply
    425.82x = 638.43 × 220.29
  4. Step 4: Simplify right side
    425.82x = 140,639.74
  5. Step 5: Solve for x
    x = 140,639.74/425.82
  6. Step 6: Final answer
    x = 330.28

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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.