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Finding the Fourth Proportional to 425.75, 638.64 and 137.18

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Solution

The fourth proportional to 425.75, 638.64 and 137.18 is: 205.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.75 : 638.64 = 137.18 : x
  2. Step 2: Convert to fraction form
    425.75/638.64 = 137.18/x
  3. Step 3: Cross multiply
    425.75x = 638.64 × 137.18
  4. Step 4: Simplify right side
    425.75x = 87,608.64
  5. Step 5: Solve for x
    x = 87,608.64/425.75
  6. Step 6: Final answer
    x = 205.77

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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.