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Finding the Third Proportional to 15,720 and 33,690

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Solution

The third proportional to 15,720 and 33,690 is: 72,202.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720 : 33,690 = 33,690 : x
  2. Step 2: Convert to fraction form
    15,720/33,690 = 33,690/x
  3. Step 3: Cross multiply
    15,720x = 33,690 × 33,690
  4. Step 4: Simplify right side
    15,720x = 1,135,016,100
  5. Step 5: Solve for x
    x = 1,135,016,100/15,720
  6. Step 6: Final answer
    x = 72,202.04

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.