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Finding the Third Proportional to 8,640 and 18,960.75

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Solution

The third proportional to 8,640 and 18,960.75 is: 41,609.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640 : 18,960.75 = 18,960.75 : x
  2. Step 2: Convert to fraction form
    8,640/18,960.75 = 18,960.75/x
  3. Step 3: Cross multiply
    8,640x = 18,960.75 × 18,960.75
  4. Step 4: Simplify right side
    8,640x = 359,510,040.56
  5. Step 5: Solve for x
    x = 359,510,040.56/8,640
  6. Step 6: Final answer
    x = 41,609.96

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.