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Finding the Third Proportional to 128,766.75 and 199,380.75

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Solution

The third proportional to 128,766.75 and 199,380.75 is: 308,718.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,766.75 : 199,380.75 = 199,380.75 : x
  2. Step 2: Convert to fraction form
    128,766.75/199,380.75 = 199,380.75/x
  3. Step 3: Cross multiply
    128,766.75x = 199,380.75 × 199,380.75
  4. Step 4: Simplify right side
    128,766.75x = 39,752,683,470.56
  5. Step 5: Solve for x
    x = 39,752,683,470.56/128,766.75
  6. Step 6: Final answer
    x = 308,718.54

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.