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Finding the Third Proportional to 257,822 and 398,398

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Solution

The third proportional to 257,822 and 398,398 is: 615,622.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,822 : 398,398 = 398,398 : x
  2. Step 2: Convert to fraction form
    257,822/398,398 = 398,398/x
  3. Step 3: Cross multiply
    257,822x = 398,398 × 398,398
  4. Step 4: Simplify right side
    257,822x = 158,720,966,404
  5. Step 5: Solve for x
    x = 158,720,966,404/257,822
  6. Step 6: Final answer
    x = 615,622.28

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.