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Finding the Fourth Proportional to 425.46, 638.15 and 136.90

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Solution

The fourth proportional to 425.46, 638.15 and 136.90 is: 205.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.46 : 638.15 = 136.90 : x
  2. Step 2: Convert to fraction form
    425.46/638.15 = 136.90/x
  3. Step 3: Cross multiply
    425.46x = 638.15 × 136.90
  4. Step 4: Simplify right side
    425.46x = 87,362.85
  5. Step 5: Solve for x
    x = 87,362.85/425.46
  6. Step 6: Final answer
    x = 205.34

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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.