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Finding the Fourth Proportional to 18,940.92, 28,408.64 and 5,789.76

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Solution

The fourth proportional to 18,940.92, 28,408.64 and 5,789.76 is: 8,683.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.92 : 28,408.64 = 5,789.76 : x
  2. Step 2: Convert to fraction form
    18,940.92/28,408.64 = 5,789.76/x
  3. Step 3: Cross multiply
    18,940.92x = 28,408.64 × 5,789.76
  4. Step 4: Simplify right side
    18,940.92x = 164,479,207.53
  5. Step 5: Solve for x
    x = 164,479,207.53/18,940.92
  6. Step 6: Final answer
    x = 8,683.80

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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.