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Finding the Third Proportional to 81,699 and 171,642

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Solution

The third proportional to 81,699 and 171,642 is: 360,603.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,699 : 171,642 = 171,642 : x
  2. Step 2: Convert to fraction form
    81,699/171,642 = 171,642/x
  3. Step 3: Cross multiply
    81,699x = 171,642 × 171,642
  4. Step 4: Simplify right side
    81,699x = 29,460,976,164
  5. Step 5: Solve for x
    x = 29,460,976,164/81,699
  6. Step 6: Final answer
    x = 360,603.88

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.