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Finding the Fourth Proportional to 18,990.87, 28,493.97 and 8,453.69

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Solution

The fourth proportional to 18,990.87, 28,493.97 and 8,453.69 is: 12,683.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.87 : 28,493.97 = 8,453.69 : x
  2. Step 2: Convert to fraction form
    18,990.87/28,493.97 = 8,453.69/x
  3. Step 3: Cross multiply
    18,990.87x = 28,493.97 × 8,453.69
  4. Step 4: Simplify right side
    18,990.87x = 240,879,249.62
  5. Step 5: Solve for x
    x = 240,879,249.62/18,990.87
  6. Step 6: Final answer
    x = 12,683.95

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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.