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Finding the Fourth Proportional to 13,919.88, 20,879.68 and 11,163.84

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Solution

The fourth proportional to 13,919.88, 20,879.68 and 11,163.84 is: 16,745.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.88 : 20,879.68 = 11,163.84 : x
  2. Step 2: Convert to fraction form
    13,919.88/20,879.68 = 11,163.84/x
  3. Step 3: Cross multiply
    13,919.88x = 20,879.68 × 11,163.84
  4. Step 4: Simplify right side
    13,919.88x = 233,097,406.77
  5. Step 5: Solve for x
    x = 233,097,406.77/13,919.88
  6. Step 6: Final answer
    x = 16,745.65

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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.