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Finding the Fourth Proportional to 18,640, 27,963.84 and 7,696

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Solution

The fourth proportional to 18,640, 27,963.84 and 7,696 is: 11,545.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640 : 27,963.84 = 7,696 : x
  2. Step 2: Convert to fraction form
    18,640/27,963.84 = 7,696/x
  3. Step 3: Cross multiply
    18,640x = 27,963.84 × 7,696
  4. Step 4: Simplify right side
    18,640x = 215,209,712.64
  5. Step 5: Solve for x
    x = 215,209,712.64/18,640
  6. Step 6: Final answer
    x = 11,545.59

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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.