Home / 20,481.60-30,716.40-7,998.78

Finding the Fourth Proportional to 20,481.60, 30,716.40 and 7,998.78

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Solution

The fourth proportional to 20,481.60, 30,716.40 and 7,998.78 is: 11,995.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,481.60 : 30,716.40 = 7,998.78 : x
  2. Step 2: Convert to fraction form
    20,481.60/30,716.40 = 7,998.78/x
  3. Step 3: Cross multiply
    20,481.60x = 30,716.40 × 7,998.78
  4. Step 4: Simplify right side
    20,481.60x = 245,693,725.99
  5. Step 5: Solve for x
    x = 245,693,725.99/20,481.60
  6. Step 6: Final answer
    x = 11,995.83

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1.5x scale

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.