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Finding the Fourth Proportional to 21,487.31, 29,652.80 and 11,927.82

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Solution

The fourth proportional to 21,487.31, 29,652.80 and 11,927.82 is: 16,460.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,487.31 : 29,652.80 = 11,927.82 : x
  2. Step 2: Convert to fraction form
    21,487.31/29,652.80 = 11,927.82/x
  3. Step 3: Cross multiply
    21,487.31x = 29,652.80 × 11,927.82
  4. Step 4: Simplify right side
    21,487.31x = 353,693,260.90
  5. Step 5: Solve for x
    x = 353,693,260.90/21,487.31
  6. Step 6: Final answer
    x = 16,460.56

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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.