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Finding the Third Proportional to 54,780 and 78,281

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Solution

The third proportional to 54,780 and 78,281 is: 111,864.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,780 : 78,281 = 78,281 : x
  2. Step 2: Convert to fraction form
    54,780/78,281 = 78,281/x
  3. Step 3: Cross multiply
    54,780x = 78,281 × 78,281
  4. Step 4: Simplify right side
    54,780x = 6,127,914,961
  5. Step 5: Solve for x
    x = 6,127,914,961/54,780
  6. Step 6: Final answer
    x = 111,864.09

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.