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Finding the Third Proportional to 87,489 and 135,730

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Solution

The third proportional to 87,489 and 135,730 is: 210,570.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,489 : 135,730 = 135,730 : x
  2. Step 2: Convert to fraction form
    87,489/135,730 = 135,730/x
  3. Step 3: Cross multiply
    87,489x = 135,730 × 135,730
  4. Step 4: Simplify right side
    87,489x = 18,422,632,900
  5. Step 5: Solve for x
    x = 18,422,632,900/87,489
  6. Step 6: Final answer
    x = 210,570.85

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.