Home / 3,889.15-5,367.08-2,120.78

Finding the Fourth Proportional to 3,889.15, 5,367.08 and 2,120.78

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Solution

The fourth proportional to 3,889.15, 5,367.08 and 2,120.78 is: 2,926.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.15 : 5,367.08 = 2,120.78 : x
  2. Step 2: Convert to fraction form
    3,889.15/5,367.08 = 2,120.78/x
  3. Step 3: Cross multiply
    3,889.15x = 5,367.08 × 2,120.78
  4. Step 4: Simplify right side
    3,889.15x = 11,382,385.32
  5. Step 5: Solve for x
    x = 11,382,385.32/3,889.15
  6. Step 6: Final answer
    x = 2,926.71

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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.