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Finding the Fourth Proportional to 66,143.78, 99,229.34 and 21,773.20

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Solution

The fourth proportional to 66,143.78, 99,229.34 and 21,773.20 is: 32,664.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,143.78 : 99,229.34 = 21,773.20 : x
  2. Step 2: Convert to fraction form
    66,143.78/99,229.34 = 21,773.20/x
  3. Step 3: Cross multiply
    66,143.78x = 99,229.34 × 21,773.20
  4. Step 4: Simplify right side
    66,143.78x = 2,160,539,660.68
  5. Step 5: Solve for x
    x = 2,160,539,660.68/66,143.78
  6. Step 6: Final answer
    x = 32,664.29

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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.