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Finding the Third Proportional to 86,421 and 131,379

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Solution

The third proportional to 86,421 and 131,379 is: 199,725.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,421 : 131,379 = 131,379 : x
  2. Step 2: Convert to fraction form
    86,421/131,379 = 131,379/x
  3. Step 3: Cross multiply
    86,421x = 131,379 × 131,379
  4. Step 4: Simplify right side
    86,421x = 17,260,441,641
  5. Step 5: Solve for x
    x = 17,260,441,641/86,421
  6. Step 6: Final answer
    x = 199,725.09

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.