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Finding the Third Proportional to 82,420 and 179,939

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Solution

The third proportional to 82,420 and 179,939 is: 392,842.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,420 : 179,939 = 179,939 : x
  2. Step 2: Convert to fraction form
    82,420/179,939 = 179,939/x
  3. Step 3: Cross multiply
    82,420x = 179,939 × 179,939
  4. Step 4: Simplify right side
    82,420x = 32,378,043,721
  5. Step 5: Solve for x
    x = 32,378,043,721/82,420
  6. Step 6: Final answer
    x = 392,842.07

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.