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Finding the Fourth Proportional to 425.62, 638.36 and 137.02

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Solution

The fourth proportional to 425.62, 638.36 and 137.02 is: 205.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.62 : 638.36 = 137.02 : x
  2. Step 2: Convert to fraction form
    425.62/638.36 = 137.02/x
  3. Step 3: Cross multiply
    425.62x = 638.36 × 137.02
  4. Step 4: Simplify right side
    425.62x = 87,464.90
  5. Step 5: Solve for x
    x = 87,464.90/425.62
  6. Step 6: Final answer
    x = 205.50

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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.