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Finding the Fourth Proportional to 5,129.37, 7,078.11 and 2,891.79

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Solution

The fourth proportional to 5,129.37, 7,078.11 and 2,891.79 is: 3,990.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.37 : 7,078.11 = 2,891.79 : x
  2. Step 2: Convert to fraction form
    5,129.37/7,078.11 = 2,891.79/x
  3. Step 3: Cross multiply
    5,129.37x = 7,078.11 × 2,891.79
  4. Step 4: Simplify right side
    5,129.37x = 20,468,430.69
  5. Step 5: Solve for x
    x = 20,468,430.69/5,129.37
  6. Step 6: Final answer
    x = 3,990.44

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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.