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Finding the Fourth Proportional to 21,757.12, 29,998.56 and 18,394

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Solution

The fourth proportional to 21,757.12, 29,998.56 and 18,394 is: 25,361.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,757.12 : 29,998.56 = 18,394 : x
  2. Step 2: Convert to fraction form
    21,757.12/29,998.56 = 18,394/x
  3. Step 3: Cross multiply
    21,757.12x = 29,998.56 × 18,394
  4. Step 4: Simplify right side
    21,757.12x = 551,793,512.64
  5. Step 5: Solve for x
    x = 551,793,512.64/21,757.12
  6. Step 6: Final answer
    x = 25,361.51

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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.