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Finding the Fourth Proportional to 68,639.91, 102,961.68 and 21,892.78

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Solution

The fourth proportional to 68,639.91, 102,961.68 and 21,892.78 is: 32,839.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,639.91 : 102,961.68 = 21,892.78 : x
  2. Step 2: Convert to fraction form
    68,639.91/102,961.68 = 21,892.78/x
  3. Step 3: Cross multiply
    68,639.91x = 102,961.68 × 21,892.78
  4. Step 4: Simplify right side
    68,639.91x = 2,254,117,578.42
  5. Step 5: Solve for x
    x = 2,254,117,578.42/68,639.91
  6. Step 6: Final answer
    x = 32,839.75

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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.