Home / 20,976.76-31,455.42-7,819.66

Finding the Fourth Proportional to 20,976.76, 31,455.42 and 7,819.66

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Solution

The fourth proportional to 20,976.76, 31,455.42 and 7,819.66 is: 11,725.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976.76 : 31,455.42 = 7,819.66 : x
  2. Step 2: Convert to fraction form
    20,976.76/31,455.42 = 7,819.66/x
  3. Step 3: Cross multiply
    20,976.76x = 31,455.42 × 7,819.66
  4. Step 4: Simplify right side
    20,976.76x = 245,970,689.56
  5. Step 5: Solve for x
    x = 245,970,689.56/20,976.76
  6. Step 6: Final answer
    x = 11,725.87

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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.