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Finding the Third Proportional to 387,122 and 809,728

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Solution

The third proportional to 387,122 and 809,728 is: 1,693,676.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,122 : 809,728 = 809,728 : x
  2. Step 2: Convert to fraction form
    387,122/809,728 = 809,728/x
  3. Step 3: Cross multiply
    387,122x = 809,728 × 809,728
  4. Step 4: Simplify right side
    387,122x = 655,659,433,984
  5. Step 5: Solve for x
    x = 655,659,433,984/387,122
  6. Step 6: Final answer
    x = 1,693,676.50

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.