Home / 3,121.78-4,311.09-1,943.38

Finding the Fourth Proportional to 3,121.78, 4,311.09 and 1,943.38

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Solution

The fourth proportional to 3,121.78, 4,311.09 and 1,943.38 is: 2,683.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.78 : 4,311.09 = 1,943.38 : x
  2. Step 2: Convert to fraction form
    3,121.78/4,311.09 = 1,943.38/x
  3. Step 3: Cross multiply
    3,121.78x = 4,311.09 × 1,943.38
  4. Step 4: Simplify right side
    3,121.78x = 8,378,086.08
  5. Step 5: Solve for x
    x = 8,378,086.08/3,121.78
  6. Step 6: Final answer
    x = 2,683.75

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.