Home / 20,661.39-28,512.84-12,163.88

Finding the Fourth Proportional to 20,661.39, 28,512.84 and 12,163.88

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Solution

The fourth proportional to 20,661.39, 28,512.84 and 12,163.88 is: 16,786.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.39 : 28,512.84 = 12,163.88 : x
  2. Step 2: Convert to fraction form
    20,661.39/28,512.84 = 12,163.88/x
  3. Step 3: Cross multiply
    20,661.39x = 28,512.84 × 12,163.88
  4. Step 4: Simplify right side
    20,661.39x = 346,826,621.66
  5. Step 5: Solve for x
    x = 346,826,621.66/20,661.39
  6. Step 6: Final answer
    x = 16,786.22

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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.