Home / 13,819.92-20,715.09-7,149.70

Finding the Fourth Proportional to 13,819.92, 20,715.09 and 7,149.70

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Solution

The fourth proportional to 13,819.92, 20,715.09 and 7,149.70 is: 10,716.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,819.92 : 20,715.09 = 7,149.70 : x
  2. Step 2: Convert to fraction form
    13,819.92/20,715.09 = 7,149.70/x
  3. Step 3: Cross multiply
    13,819.92x = 20,715.09 × 7,149.70
  4. Step 4: Simplify right side
    13,819.92x = 148,106,678.97
  5. Step 5: Solve for x
    x = 148,106,678.97/13,819.92
  6. Step 6: Final answer
    x = 10,716.90

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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.