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Finding the Fourth Proportional to 425.44, 638.20 and 136.88

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Solution

The fourth proportional to 425.44, 638.20 and 136.88 is: 205.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.44 : 638.20 = 136.88 : x
  2. Step 2: Convert to fraction form
    425.44/638.20 = 136.88/x
  3. Step 3: Cross multiply
    425.44x = 638.20 × 136.88
  4. Step 4: Simplify right side
    425.44x = 87,356.82
  5. Step 5: Solve for x
    x = 87,356.82/425.44
  6. Step 6: Final answer
    x = 205.33

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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.