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Finding the Fourth Proportional to 128,766.31, 177,696.94 and 72,177.68

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Solution

The fourth proportional to 128,766.31, 177,696.94 and 72,177.68 is: 99,604.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,766.31 : 177,696.94 = 72,177.68 : x
  2. Step 2: Convert to fraction form
    128,766.31/177,696.94 = 72,177.68/x
  3. Step 3: Cross multiply
    128,766.31x = 177,696.94 × 72,177.68
  4. Step 4: Simplify right side
    128,766.31x = 12,825,753,271.43
  5. Step 5: Solve for x
    x = 12,825,753,271.43/128,766.31
  6. Step 6: Final answer
    x = 99,604.89

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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.