Home / 3,936.81-5,908.86-1,990.38

Finding the Fourth Proportional to 3,936.81, 5,908.86 and 1,990.38

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Solution

The fourth proportional to 3,936.81, 5,908.86 and 1,990.38 is: 2,987.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.81 : 5,908.86 = 1,990.38 : x
  2. Step 2: Convert to fraction form
    3,936.81/5,908.86 = 1,990.38/x
  3. Step 3: Cross multiply
    3,936.81x = 5,908.86 × 1,990.38
  4. Step 4: Simplify right side
    3,936.81x = 11,760,876.77
  5. Step 5: Solve for x
    x = 11,760,876.77/3,936.81
  6. Step 6: Final answer
    x = 2,987.41

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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.