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Finding the Fourth Proportional to 7,879.61, 11,819.80 and 3,197.21

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Solution

The fourth proportional to 7,879.61, 11,819.80 and 3,197.21 is: 4,795.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,879.61 : 11,819.80 = 3,197.21 : x
  2. Step 2: Convert to fraction form
    7,879.61/11,819.80 = 3,197.21/x
  3. Step 3: Cross multiply
    7,879.61x = 11,819.80 × 3,197.21
  4. Step 4: Simplify right side
    7,879.61x = 37,790,321.01
  5. Step 5: Solve for x
    x = 37,790,321.01/7,879.61
  6. Step 6: Final answer
    x = 4,795.97

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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.