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Finding the Fourth Proportional to 7,990.80, 11,989.08 and 3,604.92

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Solution

The fourth proportional to 7,990.80, 11,989.08 and 3,604.92 is: 5,408.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.80 : 11,989.08 = 3,604.92 : x
  2. Step 2: Convert to fraction form
    7,990.80/11,989.08 = 3,604.92/x
  3. Step 3: Cross multiply
    7,990.80x = 11,989.08 × 3,604.92
  4. Step 4: Simplify right side
    7,990.80x = 43,219,674.27
  5. Step 5: Solve for x
    x = 43,219,674.27/7,990.80
  6. Step 6: Final answer
    x = 5,408.68

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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.