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Finding the Third Proportional to 400,534 and 812,120

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Solution

The third proportional to 400,534 and 812,120 is: 1,646,648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,534 : 812,120 = 812,120 : x
  2. Step 2: Convert to fraction form
    400,534/812,120 = 812,120/x
  3. Step 3: Cross multiply
    400,534x = 812,120 × 812,120
  4. Step 4: Simplify right side
    400,534x = 659,538,894,400
  5. Step 5: Solve for x
    x = 659,538,894,400/400,534
  6. Step 6: Final answer
    x = 1,646,648.96

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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.