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Finding the Third Proportional to 39,890 and 85,060

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Solution

The third proportional to 39,890 and 85,060 is: 181,378.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890 : 85,060 = 85,060 : x
  2. Step 2: Convert to fraction form
    39,890/85,060 = 85,060/x
  3. Step 3: Cross multiply
    39,890x = 85,060 × 85,060
  4. Step 4: Simplify right side
    39,890x = 7,235,203,600
  5. Step 5: Solve for x
    x = 7,235,203,600/39,890
  6. Step 6: Final answer
    x = 181,378.88

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.