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Finding the Third Proportional to 81,378 and 129,451.50

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Solution

The third proportional to 81,378 and 129,451.50 is: 205,924.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,378 : 129,451.50 = 129,451.50 : x
  2. Step 2: Convert to fraction form
    81,378/129,451.50 = 129,451.50/x
  3. Step 3: Cross multiply
    81,378x = 129,451.50 × 129,451.50
  4. Step 4: Simplify right side
    81,378x = 16,757,690,852.25
  5. Step 5: Solve for x
    x = 16,757,690,852.25/81,378
  6. Step 6: Final answer
    x = 205,924.09

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.