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Finding the Fourth Proportional to 21,161, 29,202.18 and 11,731

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Solution

The fourth proportional to 21,161, 29,202.18 and 11,731 is: 16,188.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161 : 29,202.18 = 11,731 : x
  2. Step 2: Convert to fraction form
    21,161/29,202.18 = 11,731/x
  3. Step 3: Cross multiply
    21,161x = 29,202.18 × 11,731
  4. Step 4: Simplify right side
    21,161x = 342,570,773.58
  5. Step 5: Solve for x
    x = 342,570,773.58/21,161
  6. Step 6: Final answer
    x = 16,188.78

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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.