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Finding the Third Proportional to 477,740 and 690,609

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Solution

The third proportional to 477,740 and 690,609 is: 998,327.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    477,740 : 690,609 = 690,609 : x
  2. Step 2: Convert to fraction form
    477,740/690,609 = 690,609/x
  3. Step 3: Cross multiply
    477,740x = 690,609 × 690,609
  4. Step 4: Simplify right side
    477,740x = 476,940,790,881
  5. Step 5: Solve for x
    x = 476,940,790,881/477,740
  6. Step 6: Final answer
    x = 998,327.10

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.