Home / 13,458.92-20,189.12-5,139.61

Finding the Fourth Proportional to 13,458.92, 20,189.12 and 5,139.61

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Solution

The fourth proportional to 13,458.92, 20,189.12 and 5,139.61 is: 7,709.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,458.92 : 20,189.12 = 5,139.61 : x
  2. Step 2: Convert to fraction form
    13,458.92/20,189.12 = 5,139.61/x
  3. Step 3: Cross multiply
    13,458.92x = 20,189.12 × 5,139.61
  4. Step 4: Simplify right side
    13,458.92x = 103,764,126.87
  5. Step 5: Solve for x
    x = 103,764,126.87/13,458.92
  6. Step 6: Final answer
    x = 7,709.69

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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.