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Finding the Fourth Proportional to 3,879.79, 5,809.36 and 2,649.61

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Solution

The fourth proportional to 3,879.79, 5,809.36 and 2,649.61 is: 3,967.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.79 : 5,809.36 = 2,649.61 : x
  2. Step 2: Convert to fraction form
    3,879.79/5,809.36 = 2,649.61/x
  3. Step 3: Cross multiply
    3,879.79x = 5,809.36 × 2,649.61
  4. Step 4: Simplify right side
    3,879.79x = 15,392,509.30
  5. Step 5: Solve for x
    x = 15,392,509.30/3,879.79
  6. Step 6: Final answer
    x = 3,967.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.