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Finding the Fourth Proportional to 20,120, 27,765.60 and 11,288

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Solution

The fourth proportional to 20,120, 27,765.60 and 11,288 is: 15,577.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120 : 27,765.60 = 11,288 : x
  2. Step 2: Convert to fraction form
    20,120/27,765.60 = 11,288/x
  3. Step 3: Cross multiply
    20,120x = 27,765.60 × 11,288
  4. Step 4: Simplify right side
    20,120x = 313,418,092.80
  5. Step 5: Solve for x
    x = 313,418,092.80/20,120
  6. Step 6: Final answer
    x = 15,577.44

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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.