Home / 3,889.15-5,366.86-2,120.75

Finding the Fourth Proportional to 3,889.15, 5,366.86 and 2,120.75

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Solution

The fourth proportional to 3,889.15, 5,366.86 and 2,120.75 is: 2,926.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.15 : 5,366.86 = 2,120.75 : x
  2. Step 2: Convert to fraction form
    3,889.15/5,366.86 = 2,120.75/x
  3. Step 3: Cross multiply
    3,889.15x = 5,366.86 × 2,120.75
  4. Step 4: Simplify right side
    3,889.15x = 11,381,756.33
  5. Step 5: Solve for x
    x = 11,381,756.33/3,889.15
  6. Step 6: Final answer
    x = 2,926.54

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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.