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Finding the Third Proportional to 321,682 and 687,539

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Solution

The third proportional to 321,682 and 687,539 is: 1,469,494.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,682 : 687,539 = 687,539 : x
  2. Step 2: Convert to fraction form
    321,682/687,539 = 687,539/x
  3. Step 3: Cross multiply
    321,682x = 687,539 × 687,539
  4. Step 4: Simplify right side
    321,682x = 472,709,876,521
  5. Step 5: Solve for x
    x = 472,709,876,521/321,682
  6. Step 6: Final answer
    x = 1,469,494.33

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.