Home / 1,378.15-2,067.59-453.85

Finding the Fourth Proportional to 1,378.15, 2,067.59 and 453.85

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Solution

The fourth proportional to 1,378.15, 2,067.59 and 453.85 is: 680.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.15 : 2,067.59 = 453.85 : x
  2. Step 2: Convert to fraction form
    1,378.15/2,067.59 = 453.85/x
  3. Step 3: Cross multiply
    1,378.15x = 2,067.59 × 453.85
  4. Step 4: Simplify right side
    1,378.15x = 938,375.72
  5. Step 5: Solve for x
    x = 938,375.72/1,378.15
  6. Step 6: Final answer
    x = 680.90

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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.