Home / 20,819.39-28,731.17-11,388.56

Finding the Fourth Proportional to 20,819.39, 28,731.17 and 11,388.56

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Solution

The fourth proportional to 20,819.39, 28,731.17 and 11,388.56 is: 15,716.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.39 : 28,731.17 = 11,388.56 : x
  2. Step 2: Convert to fraction form
    20,819.39/28,731.17 = 11,388.56/x
  3. Step 3: Cross multiply
    20,819.39x = 28,731.17 × 11,388.56
  4. Step 4: Simplify right side
    20,819.39x = 327,206,538.23
  5. Step 5: Solve for x
    x = 327,206,538.23/20,819.39
  6. Step 6: Final answer
    x = 15,716.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.