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Finding the Fourth Proportional to 172,976.61, 259,496.28 and 78,251.43

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Solution

The fourth proportional to 172,976.61, 259,496.28 and 78,251.43 is: 117,391.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,976.61 : 259,496.28 = 78,251.43 : x
  2. Step 2: Convert to fraction form
    172,976.61/259,496.28 = 78,251.43/x
  3. Step 3: Cross multiply
    172,976.61x = 259,496.28 × 78,251.43
  4. Step 4: Simplify right side
    172,976.61x = 20,305,954,989.68
  5. Step 5: Solve for x
    x = 20,305,954,989.68/172,976.61
  6. Step 6: Final answer
    x = 117,391.33

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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.