Home / 1,381.20-2,067.84-1,335.12

Finding the Fourth Proportional to 1,381.20, 2,067.84 and 1,335.12

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Solution

The fourth proportional to 1,381.20, 2,067.84 and 1,335.12 is: 1,998.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.20 : 2,067.84 = 1,335.12 : x
  2. Step 2: Convert to fraction form
    1,381.20/2,067.84 = 1,335.12/x
  3. Step 3: Cross multiply
    1,381.20x = 2,067.84 × 1,335.12
  4. Step 4: Simplify right side
    1,381.20x = 2,760,814.54
  5. Step 5: Solve for x
    x = 2,760,814.54/1,381.20
  6. Step 6: Final answer
    x = 1,998.85

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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.