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Finding the Fourth Proportional to 3,879.28, 5,354.94 and 2,981.26

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Solution

The fourth proportional to 3,879.28, 5,354.94 and 2,981.26 is: 4,115.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.28 : 5,354.94 = 2,981.26 : x
  2. Step 2: Convert to fraction form
    3,879.28/5,354.94 = 2,981.26/x
  3. Step 3: Cross multiply
    3,879.28x = 5,354.94 × 2,981.26
  4. Step 4: Simplify right side
    3,879.28x = 15,964,468.42
  5. Step 5: Solve for x
    x = 15,964,468.42/3,879.28
  6. Step 6: Final answer
    x = 4,115.32

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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.