Home / 3,911.21-5,396.11-2,231.40

Finding the Fourth Proportional to 3,911.21, 5,396.11 and 2,231.40

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Solution

The fourth proportional to 3,911.21, 5,396.11 and 2,231.40 is: 3,078.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.21 : 5,396.11 = 2,231.40 : x
  2. Step 2: Convert to fraction form
    3,911.21/5,396.11 = 2,231.40/x
  3. Step 3: Cross multiply
    3,911.21x = 5,396.11 × 2,231.40
  4. Step 4: Simplify right side
    3,911.21x = 12,040,879.85
  5. Step 5: Solve for x
    x = 12,040,879.85/3,911.21
  6. Step 6: Final answer
    x = 3,078.56

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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.