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Finding the Fourth Proportional to 7,991.54, 11,990.19 and 2,798.18

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Solution

The fourth proportional to 7,991.54, 11,990.19 and 2,798.18 is: 4,198.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.54 : 11,990.19 = 2,798.18 : x
  2. Step 2: Convert to fraction form
    7,991.54/11,990.19 = 2,798.18/x
  3. Step 3: Cross multiply
    7,991.54x = 11,990.19 × 2,798.18
  4. Step 4: Simplify right side
    7,991.54x = 33,550,709.85
  5. Step 5: Solve for x
    x = 33,550,709.85/7,991.54
  6. Step 6: Final answer
    x = 4,198.28

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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.