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Finding the Fourth Proportional to 18,691.81, 25,791.74 and 11,137.95

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Solution

The fourth proportional to 18,691.81, 25,791.74 and 11,137.95 is: 15,368.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.81 : 25,791.74 = 11,137.95 : x
  2. Step 2: Convert to fraction form
    18,691.81/25,791.74 = 11,137.95/x
  3. Step 3: Cross multiply
    18,691.81x = 25,791.74 × 11,137.95
  4. Step 4: Simplify right side
    18,691.81x = 287,267,054.84
  5. Step 5: Solve for x
    x = 287,267,054.84/18,691.81
  6. Step 6: Final answer
    x = 15,368.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.