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Finding the Third Proportional to 8,720 and 13,116

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Solution

The third proportional to 8,720 and 13,116 is: 19,728.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720 : 13,116 = 13,116 : x
  2. Step 2: Convert to fraction form
    8,720/13,116 = 13,116/x
  3. Step 3: Cross multiply
    8,720x = 13,116 × 13,116
  4. Step 4: Simplify right side
    8,720x = 172,029,456
  5. Step 5: Solve for x
    x = 172,029,456/8,720
  6. Step 6: Final answer
    x = 19,728.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.