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Finding the Third Proportional to 321,678 and 686,912

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Solution

The third proportional to 321,678 and 686,912 is: 1,466,833.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,678 : 686,912 = 686,912 : x
  2. Step 2: Convert to fraction form
    321,678/686,912 = 686,912/x
  3. Step 3: Cross multiply
    321,678x = 686,912 × 686,912
  4. Step 4: Simplify right side
    321,678x = 471,848,095,744
  5. Step 5: Solve for x
    x = 471,848,095,744/321,678
  6. Step 6: Final answer
    x = 1,466,833.59

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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.