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Finding the Fourth Proportional to 39,963.49, 55,150.95 and 21,815.29

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Solution

The fourth proportional to 39,963.49, 55,150.95 and 21,815.29 is: 30,105.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,963.49 : 55,150.95 = 21,815.29 : x
  2. Step 2: Convert to fraction form
    39,963.49/55,150.95 = 21,815.29/x
  3. Step 3: Cross multiply
    39,963.49x = 55,150.95 × 21,815.29
  4. Step 4: Simplify right side
    39,963.49x = 1,203,133,692.27
  5. Step 5: Solve for x
    x = 1,203,133,692.27/39,963.49
  6. Step 6: Final answer
    x = 30,105.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.