Home / 3,889.26-5,367.40-2,120.90

Finding the Fourth Proportional to 3,889.26, 5,367.40 and 2,120.90

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Solution

The fourth proportional to 3,889.26, 5,367.40 and 2,120.90 is: 2,926.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.26 : 5,367.40 = 2,120.90 : x
  2. Step 2: Convert to fraction form
    3,889.26/5,367.40 = 2,120.90/x
  3. Step 3: Cross multiply
    3,889.26x = 5,367.40 × 2,120.90
  4. Step 4: Simplify right side
    3,889.26x = 11,383,686.52
  5. Step 5: Solve for x
    x = 11,383,686.52/3,889.26
  6. Step 6: Final answer
    x = 2,926.95

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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.