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Finding the Third Proportional to 12,931 and 20,195

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Solution

The third proportional to 12,931 and 20,195 is: 31,539.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,931 : 20,195 = 20,195 : x
  2. Step 2: Convert to fraction form
    12,931/20,195 = 20,195/x
  3. Step 3: Cross multiply
    12,931x = 20,195 × 20,195
  4. Step 4: Simplify right side
    12,931x = 407,838,025
  5. Step 5: Solve for x
    x = 407,838,025/12,931
  6. Step 6: Final answer
    x = 31,539.56

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.