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Finding the Fourth Proportional to 18,819.60, 28,229.40 and 4,780.68

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Solution

The fourth proportional to 18,819.60, 28,229.40 and 4,780.68 is: 7,171.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.60 : 28,229.40 = 4,780.68 : x
  2. Step 2: Convert to fraction form
    18,819.60/28,229.40 = 4,780.68/x
  3. Step 3: Cross multiply
    18,819.60x = 28,229.40 × 4,780.68
  4. Step 4: Simplify right side
    18,819.60x = 134,955,727.99
  5. Step 5: Solve for x
    x = 134,955,727.99/18,819.60
  6. Step 6: Final answer
    x = 7,171.02

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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.