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Finding the Fourth Proportional to 18,990.66, 28,486.05 and 11,194

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Solution

The fourth proportional to 18,990.66, 28,486.05 and 11,194 is: 16,791.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.66 : 28,486.05 = 11,194 : x
  2. Step 2: Convert to fraction form
    18,990.66/28,486.05 = 11,194/x
  3. Step 3: Cross multiply
    18,990.66x = 28,486.05 × 11,194
  4. Step 4: Simplify right side
    18,990.66x = 318,872,843.70
  5. Step 5: Solve for x
    x = 318,872,843.70/18,990.66
  6. Step 6: Final answer
    x = 16,791.04

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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.