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Finding the Fourth Proportional to 3,936.87, 5,908.97 and 1,990.44

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Solution

The fourth proportional to 3,936.87, 5,908.97 and 1,990.44 is: 2,987.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.87 : 5,908.97 = 1,990.44 : x
  2. Step 2: Convert to fraction form
    3,936.87/5,908.97 = 1,990.44/x
  3. Step 3: Cross multiply
    3,936.87x = 5,908.97 × 1,990.44
  4. Step 4: Simplify right side
    3,936.87x = 11,761,455.07
  5. Step 5: Solve for x
    x = 11,761,455.07/3,936.87
  6. Step 6: Final answer
    x = 2,987.51

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1.5x scale

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.