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Finding the Fourth Proportional to 425.49, 638.24 and 136.91

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Solution

The fourth proportional to 425.49, 638.24 and 136.91 is: 205.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.49 : 638.24 = 136.91 : x
  2. Step 2: Convert to fraction form
    425.49/638.24 = 136.91/x
  3. Step 3: Cross multiply
    425.49x = 638.24 × 136.91
  4. Step 4: Simplify right side
    425.49x = 87,377.56
  5. Step 5: Solve for x
    x = 87,377.56/425.49
  6. Step 6: Final answer
    x = 205.36

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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.