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Finding the Fourth Proportional to 81,340.20, 121,921.20 and 28,722.60

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Solution

The fourth proportional to 81,340.20, 121,921.20 and 28,722.60 is: 43,052.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,340.20 : 121,921.20 = 28,722.60 : x
  2. Step 2: Convert to fraction form
    81,340.20/121,921.20 = 28,722.60/x
  3. Step 3: Cross multiply
    81,340.20x = 121,921.20 × 28,722.60
  4. Step 4: Simplify right side
    81,340.20x = 3,501,893,859.12
  5. Step 5: Solve for x
    x = 3,501,893,859.12/81,340.20
  6. Step 6: Final answer
    x = 43,052.44

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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.