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Finding the Fourth Proportional to 72,542.36, 108,813.65 and 39,278.09

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Solution

The fourth proportional to 72,542.36, 108,813.65 and 39,278.09 is: 58,917.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,542.36 : 108,813.65 = 39,278.09 : x
  2. Step 2: Convert to fraction form
    72,542.36/108,813.65 = 39,278.09/x
  3. Step 3: Cross multiply
    72,542.36x = 108,813.65 × 39,278.09
  4. Step 4: Simplify right side
    72,542.36x = 4,273,992,413.57
  5. Step 5: Solve for x
    x = 4,273,992,413.57/72,542.36
  6. Step 6: Final answer
    x = 58,917.19

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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.