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Finding the Third Proportional to 129.38 and 198.56

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Solution

The third proportional to 129.38 and 198.56 is: 304.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.38 : 198.56 = 198.56 : x
  2. Step 2: Convert to fraction form
    129.38/198.56 = 198.56/x
  3. Step 3: Cross multiply
    129.38x = 198.56 × 198.56
  4. Step 4: Simplify right side
    129.38x = 39,427.07
  5. Step 5: Solve for x
    x = 39,427.07/129.38
  6. Step 6: Final answer
    x = 304.75

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.