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Finding the Third Proportional to 331,420 and 518,456

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Solution

The third proportional to 331,420 and 518,456 is: 811,045.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,420 : 518,456 = 518,456 : x
  2. Step 2: Convert to fraction form
    331,420/518,456 = 518,456/x
  3. Step 3: Cross multiply
    331,420x = 518,456 × 518,456
  4. Step 4: Simplify right side
    331,420x = 268,796,623,936
  5. Step 5: Solve for x
    x = 268,796,623,936/331,420
  6. Step 6: Final answer
    x = 811,045.27

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.