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Finding the Fourth Proportional to 21,321.31, 29,422.07 and 11,761.31

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Solution

The fourth proportional to 21,321.31, 29,422.07 and 11,761.31 is: 16,229.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.31 : 29,422.07 = 11,761.31 : x
  2. Step 2: Convert to fraction form
    21,321.31/29,422.07 = 11,761.31/x
  3. Step 3: Cross multiply
    21,321.31x = 29,422.07 × 11,761.31
  4. Step 4: Simplify right side
    21,321.31x = 346,041,968.40
  5. Step 5: Solve for x
    x = 346,041,968.40/21,321.31
  6. Step 6: Final answer
    x = 16,229.87

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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.