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Finding the Third Proportional to 128,378.25 and 187,812

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Solution

The third proportional to 128,378.25 and 187,812 is: 274,761.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,378.25 : 187,812 = 187,812 : x
  2. Step 2: Convert to fraction form
    128,378.25/187,812 = 187,812/x
  3. Step 3: Cross multiply
    128,378.25x = 187,812 × 187,812
  4. Step 4: Simplify right side
    128,378.25x = 35,273,347,344
  5. Step 5: Solve for x
    x = 35,273,347,344/128,378.25
  6. Step 6: Final answer
    x = 274,761.09

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.