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Finding the Fourth Proportional to 128,737.86, 177,668.73 and 71,382.87

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Solution

The fourth proportional to 128,737.86, 177,668.73 and 71,382.87 is: 98,514.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.86 : 177,668.73 = 71,382.87 : x
  2. Step 2: Convert to fraction form
    128,737.86/177,668.73 = 71,382.87/x
  3. Step 3: Cross multiply
    128,737.86x = 177,668.73 × 71,382.87
  4. Step 4: Simplify right side
    128,737.86x = 12,682,503,856.66
  5. Step 5: Solve for x
    x = 12,682,503,856.66/128,737.86
  6. Step 6: Final answer
    x = 98,514.17

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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.