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Finding the Third Proportional to 678,420 and 921,366

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Solution

The third proportional to 678,420 and 921,366 is: 1,251,312.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,420 : 921,366 = 921,366 : x
  2. Step 2: Convert to fraction form
    678,420/921,366 = 921,366/x
  3. Step 3: Cross multiply
    678,420x = 921,366 × 921,366
  4. Step 4: Simplify right side
    678,420x = 848,915,305,956
  5. Step 5: Solve for x
    x = 848,915,305,956/678,420
  6. Step 6: Final answer
    x = 1,251,312.32

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.