Home / 3,891.28-5,369.84-2,122.92

Finding the Fourth Proportional to 3,891.28, 5,369.84 and 2,122.92

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Solution

The fourth proportional to 3,891.28, 5,369.84 and 2,122.92 is: 2,929.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.28 : 5,369.84 = 2,122.92 : x
  2. Step 2: Convert to fraction form
    3,891.28/5,369.84 = 2,122.92/x
  3. Step 3: Cross multiply
    3,891.28x = 5,369.84 × 2,122.92
  4. Step 4: Simplify right side
    3,891.28x = 11,399,740.73
  5. Step 5: Solve for x
    x = 11,399,740.73/3,891.28
  6. Step 6: Final answer
    x = 2,929.56

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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.