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Finding the Fourth Proportional to 3,879.91, 5,354.04 and 2,178.29

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Solution

The fourth proportional to 3,879.91, 5,354.04 and 2,178.29 is: 3,005.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.91 : 5,354.04 = 2,178.29 : x
  2. Step 2: Convert to fraction form
    3,879.91/5,354.04 = 2,178.29/x
  3. Step 3: Cross multiply
    3,879.91x = 5,354.04 × 2,178.29
  4. Step 4: Simplify right side
    3,879.91x = 11,662,614.13
  5. Step 5: Solve for x
    x = 11,662,614.13/3,879.91
  6. Step 6: Final answer
    x = 3,005.90

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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.