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Finding the Third Proportional to 8,640 and 11,716

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Solution

The third proportional to 8,640 and 11,716 is: 15,887.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640 : 11,716 = 11,716 : x
  2. Step 2: Convert to fraction form
    8,640/11,716 = 11,716/x
  3. Step 3: Cross multiply
    8,640x = 11,716 × 11,716
  4. Step 4: Simplify right side
    8,640x = 137,264,656
  5. Step 5: Solve for x
    x = 137,264,656/8,640
  6. Step 6: Final answer
    x = 15,887.11

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.