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Finding the Fourth Proportional to 12,388.97, 18,578.62 and 4,489.61

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Solution

The fourth proportional to 12,388.97, 18,578.62 and 4,489.61 is: 6,732.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,388.97 : 18,578.62 = 4,489.61 : x
  2. Step 2: Convert to fraction form
    12,388.97/18,578.62 = 4,489.61/x
  3. Step 3: Cross multiply
    12,388.97x = 18,578.62 × 4,489.61
  4. Step 4: Simplify right side
    12,388.97x = 83,410,735.69
  5. Step 5: Solve for x
    x = 83,410,735.69/12,388.97
  6. Step 6: Final answer
    x = 6,732.66

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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.