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Finding the Fourth Proportional to 21,879.92, 30,194.47 and 12,449.09

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Solution

The fourth proportional to 21,879.92, 30,194.47 and 12,449.09 is: 17,179.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.92 : 30,194.47 = 12,449.09 : x
  2. Step 2: Convert to fraction form
    21,879.92/30,194.47 = 12,449.09/x
  3. Step 3: Cross multiply
    21,879.92x = 30,194.47 × 12,449.09
  4. Step 4: Simplify right side
    21,879.92x = 375,893,765.58
  5. Step 5: Solve for x
    x = 375,893,765.58/21,879.92
  6. Step 6: Final answer
    x = 17,179.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.