Home / 8,121.72-12,179.10-3,190.56

Finding the Fourth Proportional to 8,121.72, 12,179.10 and 3,190.56

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Solution

The fourth proportional to 8,121.72, 12,179.10 and 3,190.56 is: 4,784.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121.72 : 12,179.10 = 3,190.56 : x
  2. Step 2: Convert to fraction form
    8,121.72/12,179.10 = 3,190.56/x
  3. Step 3: Cross multiply
    8,121.72x = 12,179.10 × 3,190.56
  4. Step 4: Simplify right side
    8,121.72x = 38,858,149.30
  5. Step 5: Solve for x
    x = 38,858,149.30/8,121.72
  6. Step 6: Final answer
    x = 4,784.47

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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.