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Finding the Fourth Proportional to 20,481.72, 30,721.08 and 7,999.38

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Solution

The fourth proportional to 20,481.72, 30,721.08 and 7,999.38 is: 11,998.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,481.72 : 30,721.08 = 7,999.38 : x
  2. Step 2: Convert to fraction form
    20,481.72/30,721.08 = 7,999.38/x
  3. Step 3: Cross multiply
    20,481.72x = 30,721.08 × 7,999.38
  4. Step 4: Simplify right side
    20,481.72x = 245,749,592.93
  5. Step 5: Solve for x
    x = 245,749,592.93/20,481.72
  6. Step 6: Final answer
    x = 11,998.48

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1.5x scale

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.