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Finding the Fourth Proportional to 81,104.40, 121,656.60 and 28,519.20

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Solution

The fourth proportional to 81,104.40, 121,656.60 and 28,519.20 is: 42,778.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,104.40 : 121,656.60 = 28,519.20 : x
  2. Step 2: Convert to fraction form
    81,104.40/121,656.60 = 28,519.20/x
  3. Step 3: Cross multiply
    81,104.40x = 121,656.60 × 28,519.20
  4. Step 4: Simplify right side
    81,104.40x = 3,469,548,906.72
  5. Step 5: Solve for x
    x = 3,469,548,906.72/81,104.40
  6. Step 6: Final answer
    x = 42,778.80

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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.