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Finding the Fourth Proportional to 128,776.86, 177,711.44 and 81,092.97

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Solution

The fourth proportional to 128,776.86, 177,711.44 and 81,092.97 is: 111,907.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,776.86 : 177,711.44 = 81,092.97 : x
  2. Step 2: Convert to fraction form
    128,776.86/177,711.44 = 81,092.97/x
  3. Step 3: Cross multiply
    128,776.86x = 177,711.44 × 81,092.97
  4. Step 4: Simplify right side
    128,776.86x = 14,411,148,067.11
  5. Step 5: Solve for x
    x = 14,411,148,067.11/128,776.86
  6. Step 6: Final answer
    x = 111,907.90

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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.