Home / 3,900.11-5,382.12-2,131.72

Finding the Fourth Proportional to 3,900.11, 5,382.12 and 2,131.72

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Solution

The fourth proportional to 3,900.11, 5,382.12 and 2,131.72 is: 2,941.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.11 : 5,382.12 = 2,131.72 : x
  2. Step 2: Convert to fraction form
    3,900.11/5,382.12 = 2,131.72/x
  3. Step 3: Cross multiply
    3,900.11x = 5,382.12 × 2,131.72
  4. Step 4: Simplify right side
    3,900.11x = 11,473,172.85
  5. Step 5: Solve for x
    x = 11,473,172.85/3,900.11
  6. Step 6: Final answer
    x = 2,941.76

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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.