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Finding the Fourth Proportional to 1,377.43, 2,067.45 and 855.85

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Solution

The fourth proportional to 1,377.43, 2,067.45 and 855.85 is: 1,284.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.43 : 2,067.45 = 855.85 : x
  2. Step 2: Convert to fraction form
    1,377.43/2,067.45 = 855.85/x
  3. Step 3: Cross multiply
    1,377.43x = 2,067.45 × 855.85
  4. Step 4: Simplify right side
    1,377.43x = 1,769,427.08
  5. Step 5: Solve for x
    x = 1,769,427.08/1,377.43
  6. Step 6: Final answer
    x = 1,284.59

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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.