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Finding the Fourth Proportional to 1,378.87, 2,067 and 546.49

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Solution

The fourth proportional to 1,378.87, 2,067 and 546.49 is: 819.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.87 : 2,067 = 546.49 : x
  2. Step 2: Convert to fraction form
    1,378.87/2,067 = 546.49/x
  3. Step 3: Cross multiply
    1,378.87x = 2,067 × 546.49
  4. Step 4: Simplify right side
    1,378.87x = 1,129,594.83
  5. Step 5: Solve for x
    x = 1,129,594.83/1,378.87
  6. Step 6: Final answer
    x = 819.22

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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.