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Finding the Fourth Proportional to 425.89, 638.81 and 133.39

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Solution

The fourth proportional to 425.89, 638.81 and 133.39 is: 200.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.89 : 638.81 = 133.39 : x
  2. Step 2: Convert to fraction form
    425.89/638.81 = 133.39/x
  3. Step 3: Cross multiply
    425.89x = 638.81 × 133.39
  4. Step 4: Simplify right side
    425.89x = 85,207.67
  5. Step 5: Solve for x
    x = 85,207.67/425.89
  6. Step 6: Final answer
    x = 200.07

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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.