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Finding the Fourth Proportional to 18,111.50, 27,169.79 and 17,115.50

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Solution

The fourth proportional to 18,111.50, 27,169.79 and 17,115.50 is: 25,675.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,111.50 : 27,169.79 = 17,115.50 : x
  2. Step 2: Convert to fraction form
    18,111.50/27,169.79 = 17,115.50/x
  3. Step 3: Cross multiply
    18,111.50x = 27,169.79 × 17,115.50
  4. Step 4: Simplify right side
    18,111.50x = 465,024,540.75
  5. Step 5: Solve for x
    x = 465,024,540.75/18,111.50
  6. Step 6: Final answer
    x = 25,675.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.