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Finding the Fourth Proportional to 425.54, 638.91 and 418.25

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Solution

The fourth proportional to 425.54, 638.91 and 418.25 is: 627.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.54 : 638.91 = 418.25 : x
  2. Step 2: Convert to fraction form
    425.54/638.91 = 418.25/x
  3. Step 3: Cross multiply
    425.54x = 638.91 × 418.25
  4. Step 4: Simplify right side
    425.54x = 267,220.91
  5. Step 5: Solve for x
    x = 267,220.91/425.54
  6. Step 6: Final answer
    x = 627.96

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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.