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Finding the Third Proportional to 678,450 and 921,390

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Solution

The third proportional to 678,450 and 921,390 is: 1,251,322.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,450 : 921,390 = 921,390 : x
  2. Step 2: Convert to fraction form
    678,450/921,390 = 921,390/x
  3. Step 3: Cross multiply
    678,450x = 921,390 × 921,390
  4. Step 4: Simplify right side
    678,450x = 848,959,532,100
  5. Step 5: Solve for x
    x = 848,959,532,100/678,450
  6. Step 6: Final answer
    x = 1,251,322.18

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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.