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Finding the Third Proportional to 215,812 and 322,421

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Solution

The third proportional to 215,812 and 322,421 is: 481,693.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,812 : 322,421 = 322,421 : x
  2. Step 2: Convert to fraction form
    215,812/322,421 = 322,421/x
  3. Step 3: Cross multiply
    215,812x = 322,421 × 322,421
  4. Step 4: Simplify right side
    215,812x = 103,955,301,241
  5. Step 5: Solve for x
    x = 103,955,301,241/215,812
  6. Step 6: Final answer
    x = 481,693.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.