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Finding the Third Proportional to 18,720 and 39,600

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Solution

The third proportional to 18,720 and 39,600 is: 83,769.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 39,600 = 39,600 : x
  2. Step 2: Convert to fraction form
    18,720/39,600 = 39,600/x
  3. Step 3: Cross multiply
    18,720x = 39,600 × 39,600
  4. Step 4: Simplify right side
    18,720x = 1,568,160,000
  5. Step 5: Solve for x
    x = 1,568,160,000/18,720
  6. Step 6: Final answer
    x = 83,769.23

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.