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Finding the Third Proportional to 128.25 and 195.75

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Solution

The third proportional to 128.25 and 195.75 is: 298.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 195.75 = 195.75 : x
  2. Step 2: Convert to fraction form
    128.25/195.75 = 195.75/x
  3. Step 3: Cross multiply
    128.25x = 195.75 × 195.75
  4. Step 4: Simplify right side
    128.25x = 38,318.06
  5. Step 5: Solve for x
    x = 38,318.06/128.25
  6. Step 6: Final answer
    x = 298.78

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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.