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Finding the Third Proportional to 436,220 and 639,930

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Solution

The third proportional to 436,220 and 639,930 is: 938,770.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    436,220 : 639,930 = 639,930 : x
  2. Step 2: Convert to fraction form
    436,220/639,930 = 639,930/x
  3. Step 3: Cross multiply
    436,220x = 639,930 × 639,930
  4. Step 4: Simplify right side
    436,220x = 409,510,404,900
  5. Step 5: Solve for x
    x = 409,510,404,900/436,220
  6. Step 6: Final answer
    x = 938,770.36

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.