Home / 1,381.12-2,067.55-1,331.91

Finding the Fourth Proportional to 1,381.12, 2,067.55 and 1,331.91

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Solution

The fourth proportional to 1,381.12, 2,067.55 and 1,331.91 is: 1,993.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.12 : 2,067.55 = 1,331.91 : x
  2. Step 2: Convert to fraction form
    1,381.12/2,067.55 = 1,331.91/x
  3. Step 3: Cross multiply
    1,381.12x = 2,067.55 × 1,331.91
  4. Step 4: Simplify right side
    1,381.12x = 2,753,790.52
  5. Step 5: Solve for x
    x = 2,753,790.52/1,381.12
  6. Step 6: Final answer
    x = 1,993.88

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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.