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Finding the Fourth Proportional to 1,990.80, 2,991.48 and 1,067.04

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Solution

The fourth proportional to 1,990.80, 2,991.48 and 1,067.04 is: 1,603.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.80 : 2,991.48 = 1,067.04 : x
  2. Step 2: Convert to fraction form
    1,990.80/2,991.48 = 1,067.04/x
  3. Step 3: Cross multiply
    1,990.80x = 2,991.48 × 1,067.04
  4. Step 4: Simplify right side
    1,990.80x = 3,192,028.82
  5. Step 5: Solve for x
    x = 3,192,028.82/1,990.80
  6. Step 6: Final answer
    x = 1,603.39

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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.