Home / 7,991.21-11,986.80-2,147.82

Finding the Fourth Proportional to 7,991.21, 11,986.80 and 2,147.82

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Solution

The fourth proportional to 7,991.21, 11,986.80 and 2,147.82 is: 3,221.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.21 : 11,986.80 = 2,147.82 : x
  2. Step 2: Convert to fraction form
    7,991.21/11,986.80 = 2,147.82/x
  3. Step 3: Cross multiply
    7,991.21x = 11,986.80 × 2,147.82
  4. Step 4: Simplify right side
    7,991.21x = 25,745,515.28
  5. Step 5: Solve for x
    x = 25,745,515.28/7,991.21
  6. Step 6: Final answer
    x = 3,221.73

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Similar ratio
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1.5x scale

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.