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Finding the Fourth Proportional to 21,755.12, 29,995.80 and 18,392

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Solution

The fourth proportional to 21,755.12, 29,995.80 and 18,392 is: 25,358.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,755.12 : 29,995.80 = 18,392 : x
  2. Step 2: Convert to fraction form
    21,755.12/29,995.80 = 18,392/x
  3. Step 3: Cross multiply
    21,755.12x = 29,995.80 × 18,392
  4. Step 4: Simplify right side
    21,755.12x = 551,682,753.60
  5. Step 5: Solve for x
    x = 551,682,753.60/21,755.12
  6. Step 6: Final answer
    x = 25,358.75

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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.