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Finding the Fourth Proportional to 5,739.72, 7,920.74 and 3,221.82

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Solution

The fourth proportional to 5,739.72, 7,920.74 and 3,221.82 is: 4,446.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,739.72 : 7,920.74 = 3,221.82 : x
  2. Step 2: Convert to fraction form
    5,739.72/7,920.74 = 3,221.82/x
  3. Step 3: Cross multiply
    5,739.72x = 7,920.74 × 3,221.82
  4. Step 4: Simplify right side
    5,739.72x = 25,519,198.55
  5. Step 5: Solve for x
    x = 25,519,198.55/5,739.72
  6. Step 6: Final answer
    x = 4,446.07

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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.