Home / 20,820.87-31,231.59-6,780.96

Finding the Fourth Proportional to 20,820.87, 31,231.59 and 6,780.96

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Solution

The fourth proportional to 20,820.87, 31,231.59 and 6,780.96 is: 10,171.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.87 : 31,231.59 = 6,780.96 : x
  2. Step 2: Convert to fraction form
    20,820.87/31,231.59 = 6,780.96/x
  3. Step 3: Cross multiply
    20,820.87x = 31,231.59 × 6,780.96
  4. Step 4: Simplify right side
    20,820.87x = 211,780,162.53
  5. Step 5: Solve for x
    x = 211,780,162.53/20,820.87
  6. Step 6: Final answer
    x = 10,171.53

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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.