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Finding the Fourth Proportional to 18,910.92, 28,356.66 and 8,517

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Solution

The fourth proportional to 18,910.92, 28,356.66 and 8,517 is: 12,771.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.92 : 28,356.66 = 8,517 : x
  2. Step 2: Convert to fraction form
    18,910.92/28,356.66 = 8,517/x
  3. Step 3: Cross multiply
    18,910.92x = 28,356.66 × 8,517
  4. Step 4: Simplify right side
    18,910.92x = 241,513,673.22
  5. Step 5: Solve for x
    x = 241,513,673.22/18,910.92
  6. Step 6: Final answer
    x = 12,771.12

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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.