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Finding the Third Proportional to 390,057,917 and 812,400,811

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Solution

The third proportional to 390,057,917 and 812,400,811 is: 1,692,043,793.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,057,917 : 812,400,811 = 812,400,811 : x
  2. Step 2: Convert to fraction form
    390,057,917/812,400,811 = 812,400,811/x
  3. Step 3: Cross multiply
    390,057,917x = 812,400,811 × 812,400,811
  4. Step 4: Simplify right side
    390,057,917x = 659,995,077,713,457,664
  5. Step 5: Solve for x
    x = 659,995,077,713,457,664/390,057,917
  6. Step 6: Final answer
    x = 1,692,043,793.88

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.