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Finding the Third Proportional to 138.38 and 198.56

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Solution

The third proportional to 138.38 and 198.56 is: 284.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.38 : 198.56 = 198.56 : x
  2. Step 2: Convert to fraction form
    138.38/198.56 = 198.56/x
  3. Step 3: Cross multiply
    138.38x = 198.56 × 198.56
  4. Step 4: Simplify right side
    138.38x = 39,427.07
  5. Step 5: Solve for x
    x = 39,427.07/138.38
  6. Step 6: Final answer
    x = 284.93

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.