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Finding the Fourth Proportional to 8,990.49, 12,408.39 and 6,639.42

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Solution

The fourth proportional to 8,990.49, 12,408.39 and 6,639.42 is: 9,163.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.49 : 12,408.39 = 6,639.42 : x
  2. Step 2: Convert to fraction form
    8,990.49/12,408.39 = 6,639.42/x
  3. Step 3: Cross multiply
    8,990.49x = 12,408.39 × 6,639.42
  4. Step 4: Simplify right side
    8,990.49x = 82,384,512.73
  5. Step 5: Solve for x
    x = 82,384,512.73/8,990.49
  6. Step 6: Final answer
    x = 9,163.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.