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Finding the Fourth Proportional to 13,990.73, 20,989.68 and 8,479.49

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Solution

The fourth proportional to 13,990.73, 20,989.68 and 8,479.49 is: 12,721.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.73 : 20,989.68 = 8,479.49 : x
  2. Step 2: Convert to fraction form
    13,990.73/20,989.68 = 8,479.49/x
  3. Step 3: Cross multiply
    13,990.73x = 20,989.68 × 8,479.49
  4. Step 4: Simplify right side
    13,990.73x = 177,981,692.61
  5. Step 5: Solve for x
    x = 177,981,692.61/13,990.73
  6. Step 6: Final answer
    x = 12,721.41

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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.