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Finding the Third Proportional to 321,680 and 687,535

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Solution

The third proportional to 321,680 and 687,535 is: 1,469,486.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,680 : 687,535 = 687,535 : x
  2. Step 2: Convert to fraction form
    321,680/687,535 = 687,535/x
  3. Step 3: Cross multiply
    321,680x = 687,535 × 687,535
  4. Step 4: Simplify right side
    321,680x = 472,704,376,225
  5. Step 5: Solve for x
    x = 472,704,376,225/321,680
  6. Step 6: Final answer
    x = 1,469,486.37

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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.