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Finding the Fourth Proportional to 425.88, 638.88 and 137.38

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Solution

The fourth proportional to 425.88, 638.88 and 137.38 is: 206.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.88 : 638.88 = 137.38 : x
  2. Step 2: Convert to fraction form
    425.88/638.88 = 137.38/x
  3. Step 3: Cross multiply
    425.88x = 638.88 × 137.38
  4. Step 4: Simplify right side
    425.88x = 87,769.33
  5. Step 5: Solve for x
    x = 87,769.33/425.88
  6. Step 6: Final answer
    x = 206.09

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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.