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Finding the Fourth Proportional to 20,112.04, 30,163.20 and 8,434

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Solution

The fourth proportional to 20,112.04, 30,163.20 and 8,434 is: 12,648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,112.04 : 30,163.20 = 8,434 : x
  2. Step 2: Convert to fraction form
    20,112.04/30,163.20 = 8,434/x
  3. Step 3: Cross multiply
    20,112.04x = 30,163.20 × 8,434
  4. Step 4: Simplify right side
    20,112.04x = 254,396,428.80
  5. Step 5: Solve for x
    x = 254,396,428.80/20,112.04
  6. Step 6: Final answer
    x = 12,648.96

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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.