Home / 3,900.21-5,382.35-2,131.91

Finding the Fourth Proportional to 3,900.21, 5,382.35 and 2,131.91

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Solution

The fourth proportional to 3,900.21, 5,382.35 and 2,131.91 is: 2,942.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.21 : 5,382.35 = 2,131.91 : x
  2. Step 2: Convert to fraction form
    3,900.21/5,382.35 = 2,131.91/x
  3. Step 3: Cross multiply
    3,900.21x = 5,382.35 × 2,131.91
  4. Step 4: Simplify right side
    3,900.21x = 11,474,685.79
  5. Step 5: Solve for x
    x = 11,474,685.79/3,900.21
  6. Step 6: Final answer
    x = 2,942.07

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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.