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Finding the Fourth Proportional to 81,228.64, 121,842.96 and 43,819.60

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Solution

The fourth proportional to 81,228.64, 121,842.96 and 43,819.60 is: 65,729.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,228.64 : 121,842.96 = 43,819.60 : x
  2. Step 2: Convert to fraction form
    81,228.64/121,842.96 = 43,819.60/x
  3. Step 3: Cross multiply
    81,228.64x = 121,842.96 × 43,819.60
  4. Step 4: Simplify right side
    81,228.64x = 5,339,109,770.02
  5. Step 5: Solve for x
    x = 5,339,109,770.02/81,228.64
  6. Step 6: Final answer
    x = 65,729.40

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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.