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Finding the Fourth Proportional to 11,879.78, 17,819.81 and 3,115.58

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Solution

The fourth proportional to 11,879.78, 17,819.81 and 3,115.58 is: 4,673.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,879.78 : 17,819.81 = 3,115.58 : x
  2. Step 2: Convert to fraction form
    11,879.78/17,819.81 = 3,115.58/x
  3. Step 3: Cross multiply
    11,879.78x = 17,819.81 × 3,115.58
  4. Step 4: Simplify right side
    11,879.78x = 55,519,043.64
  5. Step 5: Solve for x
    x = 55,519,043.64/11,879.78
  6. Step 6: Final answer
    x = 4,673.41

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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.