Home / 20,872.82-31,310.66-8,392.84

Finding the Fourth Proportional to 20,872.82, 31,310.66 and 8,392.84

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Solution

The fourth proportional to 20,872.82, 31,310.66 and 8,392.84 is: 12,589.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.82 : 31,310.66 = 8,392.84 : x
  2. Step 2: Convert to fraction form
    20,872.82/31,310.66 = 8,392.84/x
  3. Step 3: Cross multiply
    20,872.82x = 31,310.66 × 8,392.84
  4. Step 4: Simplify right side
    20,872.82x = 262,785,359.67
  5. Step 5: Solve for x
    x = 262,785,359.67/20,872.82
  6. Step 6: Final answer
    x = 12,589.83

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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.