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Finding the Third Proportional to 39,964 and 86,980

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Solution

The third proportional to 39,964 and 86,980 is: 189,308.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,964 : 86,980 = 86,980 : x
  2. Step 2: Convert to fraction form
    39,964/86,980 = 86,980/x
  3. Step 3: Cross multiply
    39,964x = 86,980 × 86,980
  4. Step 4: Simplify right side
    39,964x = 7,565,520,400
  5. Step 5: Solve for x
    x = 7,565,520,400/39,964
  6. Step 6: Final answer
    x = 189,308.39

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.