Home / 20,780.92-31,171.44-5,198.54

Finding the Fourth Proportional to 20,780.92, 31,171.44 and 5,198.54

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Solution

The fourth proportional to 20,780.92, 31,171.44 and 5,198.54 is: 7,797.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.92 : 31,171.44 = 5,198.54 : x
  2. Step 2: Convert to fraction form
    20,780.92/31,171.44 = 5,198.54/x
  3. Step 3: Cross multiply
    20,780.92x = 31,171.44 × 5,198.54
  4. Step 4: Simplify right side
    20,780.92x = 162,045,977.70
  5. Step 5: Solve for x
    x = 162,045,977.70/20,780.92
  6. Step 6: Final answer
    x = 7,797.83

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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.