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Finding the Fourth Proportional to 81,028.53, 121,542.79 and 21,864.20

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Solution

The fourth proportional to 81,028.53, 121,542.79 and 21,864.20 is: 32,796.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,028.53 : 121,542.79 = 21,864.20 : x
  2. Step 2: Convert to fraction form
    81,028.53/121,542.79 = 21,864.20/x
  3. Step 3: Cross multiply
    81,028.53x = 121,542.79 × 21,864.20
  4. Step 4: Simplify right side
    81,028.53x = 2,657,435,869.12
  5. Step 5: Solve for x
    x = 2,657,435,869.12/81,028.53
  6. Step 6: Final answer
    x = 32,796.30

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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.