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Finding the Fourth Proportional to 68,640.91, 102,963.18 and 21,893.78

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Solution

The fourth proportional to 68,640.91, 102,963.18 and 21,893.78 is: 32,841.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,640.91 : 102,963.18 = 21,893.78 : x
  2. Step 2: Convert to fraction form
    68,640.91/102,963.18 = 21,893.78/x
  3. Step 3: Cross multiply
    68,640.91x = 102,963.18 × 21,893.78
  4. Step 4: Simplify right side
    68,640.91x = 2,254,253,211.02
  5. Step 5: Solve for x
    x = 2,254,253,211.02/68,640.91
  6. Step 6: Final answer
    x = 32,841.25

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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.