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Finding the Fourth Proportional to 73,209.60, 109,819.20 and 20,620.80

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Solution

The fourth proportional to 73,209.60, 109,819.20 and 20,620.80 is: 30,932.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,209.60 : 109,819.20 = 20,620.80 : x
  2. Step 2: Convert to fraction form
    73,209.60/109,819.20 = 20,620.80/x
  3. Step 3: Cross multiply
    73,209.60x = 109,819.20 × 20,620.80
  4. Step 4: Simplify right side
    73,209.60x = 2,264,559,759.36
  5. Step 5: Solve for x
    x = 2,264,559,759.36/73,209.60
  6. Step 6: Final answer
    x = 30,932.55

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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.