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Finding the Fourth Proportional to 28,906.40, 43,359.60 and 8,129.90

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Solution

The fourth proportional to 28,906.40, 43,359.60 and 8,129.90 is: 12,194.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,906.40 : 43,359.60 = 8,129.90 : x
  2. Step 2: Convert to fraction form
    28,906.40/43,359.60 = 8,129.90/x
  3. Step 3: Cross multiply
    28,906.40x = 43,359.60 × 8,129.90
  4. Step 4: Simplify right side
    28,906.40x = 352,509,212.04
  5. Step 5: Solve for x
    x = 352,509,212.04/28,906.40
  6. Step 6: Final answer
    x = 12,194.85

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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.