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Finding the Third Proportional to 400,538 and 812,128

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Solution

The third proportional to 400,538 and 812,128 is: 1,646,664.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,538 : 812,128 = 812,128 : x
  2. Step 2: Convert to fraction form
    400,538/812,128 = 812,128/x
  3. Step 3: Cross multiply
    400,538x = 812,128 × 812,128
  4. Step 4: Simplify right side
    400,538x = 659,551,888,384
  5. Step 5: Solve for x
    x = 659,551,888,384/400,538
  6. Step 6: Final answer
    x = 1,646,664.96

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.