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Finding the Fourth Proportional to 425.38, 638.08 and 133.08

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Solution

The fourth proportional to 425.38, 638.08 and 133.08 is: 199.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.38 : 638.08 = 133.08 : x
  2. Step 2: Convert to fraction form
    425.38/638.08 = 133.08/x
  3. Step 3: Cross multiply
    425.38x = 638.08 × 133.08
  4. Step 4: Simplify right side
    425.38x = 84,915.69
  5. Step 5: Solve for x
    x = 84,915.69/425.38
  6. Step 6: Final answer
    x = 199.62

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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.