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Finding the Fourth Proportional to 72,619.20, 108,928.80 and 20,028.60

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Solution

The fourth proportional to 72,619.20, 108,928.80 and 20,028.60 is: 30,042.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,619.20 : 108,928.80 = 20,028.60 : x
  2. Step 2: Convert to fraction form
    72,619.20/108,928.80 = 20,028.60/x
  3. Step 3: Cross multiply
    72,619.20x = 108,928.80 × 20,028.60
  4. Step 4: Simplify right side
    72,619.20x = 2,181,691,363.68
  5. Step 5: Solve for x
    x = 2,181,691,363.68/72,619.20
  6. Step 6: Final answer
    x = 30,042.90

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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.