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Finding the Third Proportional to 215,720 and 315,372

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Solution

The third proportional to 215,720 and 315,372 is: 461,058.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,720 : 315,372 = 315,372 : x
  2. Step 2: Convert to fraction form
    215,720/315,372 = 315,372/x
  3. Step 3: Cross multiply
    215,720x = 315,372 × 315,372
  4. Step 4: Simplify right side
    215,720x = 99,459,498,384
  5. Step 5: Solve for x
    x = 99,459,498,384/215,720
  6. Step 6: Final answer
    x = 461,058.31

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.