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Finding the Third Proportional to 421,110 and 647,930

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Solution

The third proportional to 421,110 and 647,930 is: 996,920.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,110 : 647,930 = 647,930 : x
  2. Step 2: Convert to fraction form
    421,110/647,930 = 647,930/x
  3. Step 3: Cross multiply
    421,110x = 647,930 × 647,930
  4. Step 4: Simplify right side
    421,110x = 419,813,284,900
  5. Step 5: Solve for x
    x = 419,813,284,900/421,110
  6. Step 6: Final answer
    x = 996,920.72

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.