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Finding the Fourth Proportional to 12,640.79, 18,963.95 and 3,876.39

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Solution

The fourth proportional to 12,640.79, 18,963.95 and 3,876.39 is: 5,815.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.79 : 18,963.95 = 3,876.39 : x
  2. Step 2: Convert to fraction form
    12,640.79/18,963.95 = 3,876.39/x
  3. Step 3: Cross multiply
    12,640.79x = 18,963.95 × 3,876.39
  4. Step 4: Simplify right side
    12,640.79x = 73,511,666.14
  5. Step 5: Solve for x
    x = 73,511,666.14/12,640.79
  6. Step 6: Final answer
    x = 5,815.43

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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.