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Finding the Fourth Proportional to 68,259.78, 102,388.86 and 21,512.25

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Solution

The fourth proportional to 68,259.78, 102,388.86 and 21,512.25 is: 32,268.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,259.78 : 102,388.86 = 21,512.25 : x
  2. Step 2: Convert to fraction form
    68,259.78/102,388.86 = 21,512.25/x
  3. Step 3: Cross multiply
    68,259.78x = 102,388.86 × 21,512.25
  4. Step 4: Simplify right side
    68,259.78x = 2,202,614,753.54
  5. Step 5: Solve for x
    x = 2,202,614,753.54/68,259.78
  6. Step 6: Final answer
    x = 32,268.12

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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.