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Finding the Third Proportional to 189,986 and 405,398

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Solution

The third proportional to 189,986 and 405,398 is: 865,050.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,986 : 405,398 = 405,398 : x
  2. Step 2: Convert to fraction form
    189,986/405,398 = 405,398/x
  3. Step 3: Cross multiply
    189,986x = 405,398 × 405,398
  4. Step 4: Simplify right side
    189,986x = 164,347,538,404
  5. Step 5: Solve for x
    x = 164,347,538,404/189,986
  6. Step 6: Final answer
    x = 865,050.78

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.