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Finding the Third Proportional to 12,919.50 and 20,130.75

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Solution

The third proportional to 12,919.50 and 20,130.75 is: 31,367.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,919.50 : 20,130.75 = 20,130.75 : x
  2. Step 2: Convert to fraction form
    12,919.50/20,130.75 = 20,130.75/x
  3. Step 3: Cross multiply
    12,919.50x = 20,130.75 × 20,130.75
  4. Step 4: Simplify right side
    12,919.50x = 405,247,095.56
  5. Step 5: Solve for x
    x = 405,247,095.56/12,919.50
  6. Step 6: Final answer
    x = 31,367.09

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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.