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Finding the Third Proportional to 7,981 and 12,808.75

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Solution

The third proportional to 7,981 and 12,808.75 is: 20,556.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981 : 12,808.75 = 12,808.75 : x
  2. Step 2: Convert to fraction form
    7,981/12,808.75 = 12,808.75/x
  3. Step 3: Cross multiply
    7,981x = 12,808.75 × 12,808.75
  4. Step 4: Simplify right side
    7,981x = 164,064,076.56
  5. Step 5: Solve for x
    x = 164,064,076.56/7,981
  6. Step 6: Final answer
    x = 20,556.83

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.