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Finding the Fourth Proportional to 81,321.60, 121,982.40 and 28,736.40

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Solution

The fourth proportional to 81,321.60, 121,982.40 and 28,736.40 is: 43,104.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.60 : 121,982.40 = 28,736.40 : x
  2. Step 2: Convert to fraction form
    81,321.60/121,982.40 = 28,736.40/x
  3. Step 3: Cross multiply
    81,321.60x = 121,982.40 × 28,736.40
  4. Step 4: Simplify right side
    81,321.60x = 3,505,335,039.36
  5. Step 5: Solve for x
    x = 3,505,335,039.36/81,321.60
  6. Step 6: Final answer
    x = 43,104.60

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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.