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Finding the Fourth Proportional to 20,863.17, 28,791.54 and 11,431.17

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Solution

The fourth proportional to 20,863.17, 28,791.54 and 11,431.17 is: 15,775.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.17 : 28,791.54 = 11,431.17 : x
  2. Step 2: Convert to fraction form
    20,863.17/28,791.54 = 11,431.17/x
  3. Step 3: Cross multiply
    20,863.17x = 28,791.54 × 11,431.17
  4. Step 4: Simplify right side
    20,863.17x = 329,120,988.30
  5. Step 5: Solve for x
    x = 329,120,988.30/20,863.17
  6. Step 6: Final answer
    x = 15,775.21

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