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Finding the Fourth Proportional to 7,991.58, 11,992.20 and 3,311.70

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Solution

The fourth proportional to 7,991.58, 11,992.20 and 3,311.70 is: 4,969.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.58 : 11,992.20 = 3,311.70 : x
  2. Step 2: Convert to fraction form
    7,991.58/11,992.20 = 3,311.70/x
  3. Step 3: Cross multiply
    7,991.58x = 11,992.20 × 3,311.70
  4. Step 4: Simplify right side
    7,991.58x = 39,714,568.74
  5. Step 5: Solve for x
    x = 39,714,568.74/7,991.58
  6. Step 6: Final answer
    x = 4,969.55

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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.