Home / 3,891.20-5,369.90-2,122.80

Finding the Fourth Proportional to 3,891.20, 5,369.90 and 2,122.80

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Solution

The fourth proportional to 3,891.20, 5,369.90 and 2,122.80 is: 2,929.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.20 : 5,369.90 = 2,122.80 : x
  2. Step 2: Convert to fraction form
    3,891.20/5,369.90 = 2,122.80/x
  3. Step 3: Cross multiply
    3,891.20x = 5,369.90 × 2,122.80
  4. Step 4: Simplify right side
    3,891.20x = 11,399,213.11
  5. Step 5: Solve for x
    x = 11,399,213.11/3,891.20
  6. Step 6: Final answer
    x = 2,929.49

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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.