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Finding the Fourth Proportional to 20,469.78, 30,719.25 and 8,786.34

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Solution

The fourth proportional to 20,469.78, 30,719.25 and 8,786.34 is: 13,185.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,469.78 : 30,719.25 = 8,786.34 : x
  2. Step 2: Convert to fraction form
    20,469.78/30,719.25 = 8,786.34/x
  3. Step 3: Cross multiply
    20,469.78x = 30,719.25 × 8,786.34
  4. Step 4: Simplify right side
    20,469.78x = 269,909,775.05
  5. Step 5: Solve for x
    x = 269,909,775.05/20,469.78
  6. Step 6: Final answer
    x = 13,185.77

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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.