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Finding the Fourth Proportional to 11,986.88, 17,980.31 and 3,221.79

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Solution

The fourth proportional to 11,986.88, 17,980.31 and 3,221.79 is: 4,832.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,986.88 : 17,980.31 = 3,221.79 : x
  2. Step 2: Convert to fraction form
    11,986.88/17,980.31 = 3,221.79/x
  3. Step 3: Cross multiply
    11,986.88x = 17,980.31 × 3,221.79
  4. Step 4: Simplify right side
    11,986.88x = 57,928,766.85
  5. Step 5: Solve for x
    x = 57,928,766.85/11,986.88
  6. Step 6: Final answer
    x = 4,832.68

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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.