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Finding the Fourth Proportional to 128,884, 177,859.92 and 78,593.44

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Solution

The fourth proportional to 128,884, 177,859.92 and 78,593.44 is: 108,458.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,884 : 177,859.92 = 78,593.44 : x
  2. Step 2: Convert to fraction form
    128,884/177,859.92 = 78,593.44/x
  3. Step 3: Cross multiply
    128,884x = 177,859.92 × 78,593.44
  4. Step 4: Simplify right side
    128,884x = 13,978,622,950.92
  5. Step 5: Solve for x
    x = 13,978,622,950.92/128,884
  6. Step 6: Final answer
    x = 108,458.95

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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.