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Finding the Fourth Proportional to 81,216.73, 121,815.77 and 21,251.00

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Solution

The fourth proportional to 81,216.73, 121,815.77 and 21,251.00 is: 31,874.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,216.73 : 121,815.77 = 21,251.00 : x
  2. Step 2: Convert to fraction form
    81,216.73/121,815.77 = 21,251.00/x
  3. Step 3: Cross multiply
    81,216.73x = 121,815.77 × 21,251.00
  4. Step 4: Simplify right side
    81,216.73x = 2,588,706,449.34
  5. Step 5: Solve for x
    x = 2,588,706,449.34/81,216.73
  6. Step 6: Final answer
    x = 31,874.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.