Home / 2,111.09-3,163.21-1,286.86

Finding the Fourth Proportional to 2,111.09, 3,163.21 and 1,286.86

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Solution

The fourth proportional to 2,111.09, 3,163.21 and 1,286.86 is: 1,928.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,111.09 : 3,163.21 = 1,286.86 : x
  2. Step 2: Convert to fraction form
    2,111.09/3,163.21 = 1,286.86/x
  3. Step 3: Cross multiply
    2,111.09x = 3,163.21 × 1,286.86
  4. Step 4: Simplify right side
    2,111.09x = 4,070,608.42
  5. Step 5: Solve for x
    x = 4,070,608.42/2,111.09
  6. Step 6: Final answer
    x = 1,928.20

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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.