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Finding the Fourth Proportional to 425.50, 638.25 and 136.95

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Solution

The fourth proportional to 425.50, 638.25 and 136.95 is: 205.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.50 : 638.25 = 136.95 : x
  2. Step 2: Convert to fraction form
    425.50/638.25 = 136.95/x
  3. Step 3: Cross multiply
    425.50x = 638.25 × 136.95
  4. Step 4: Simplify right side
    425.50x = 87,408.34
  5. Step 5: Solve for x
    x = 87,408.34/425.50
  6. Step 6: Final answer
    x = 205.43

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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.