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Finding the Third Proportional to 17,129.25 and 18,911.25

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Solution

The third proportional to 17,129.25 and 18,911.25 is: 20,878.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,129.25 : 18,911.25 = 18,911.25 : x
  2. Step 2: Convert to fraction form
    17,129.25/18,911.25 = 18,911.25/x
  3. Step 3: Cross multiply
    17,129.25x = 18,911.25 × 18,911.25
  4. Step 4: Simplify right side
    17,129.25x = 357,635,376.56
  5. Step 5: Solve for x
    x = 357,635,376.56/17,129.25
  6. Step 6: Final answer
    x = 20,878.64

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.