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Finding the Fourth Proportional to 7,990, 11,989.86 and 3,373

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Solution

The fourth proportional to 7,990, 11,989.86 and 3,373 is: 5,061.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990 : 11,989.86 = 3,373 : x
  2. Step 2: Convert to fraction form
    7,990/11,989.86 = 3,373/x
  3. Step 3: Cross multiply
    7,990x = 11,989.86 × 3,373
  4. Step 4: Simplify right side
    7,990x = 40,441,797.78
  5. Step 5: Solve for x
    x = 40,441,797.78/7,990
  6. Step 6: Final answer
    x = 5,061.55

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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.