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Finding the Fourth Proportional to 7,991.91, 11,979.75 and 3,825.81

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Solution

The fourth proportional to 7,991.91, 11,979.75 and 3,825.81 is: 5,734.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.91 : 11,979.75 = 3,825.81 : x
  2. Step 2: Convert to fraction form
    7,991.91/11,979.75 = 3,825.81/x
  3. Step 3: Cross multiply
    7,991.91x = 11,979.75 × 3,825.81
  4. Step 4: Simplify right side
    7,991.91x = 45,832,247.35
  5. Step 5: Solve for x
    x = 45,832,247.35/7,991.91
  6. Step 6: Final answer
    x = 5,734.83

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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.