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Finding the Third Proportional to 54,220 and 78,860

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Solution

The third proportional to 54,220 and 78,860 is: 114,697.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,220 : 78,860 = 78,860 : x
  2. Step 2: Convert to fraction form
    54,220/78,860 = 78,860/x
  3. Step 3: Cross multiply
    54,220x = 78,860 × 78,860
  4. Step 4: Simplify right side
    54,220x = 6,218,899,600
  5. Step 5: Solve for x
    x = 6,218,899,600/54,220
  6. Step 6: Final answer
    x = 114,697.52

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.