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Finding the Fourth Proportional to 128,870, 177,840.92 and 75,191.92

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Solution

The fourth proportional to 128,870, 177,840.92 and 75,191.92 is: 103,765.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,870 : 177,840.92 = 75,191.92 : x
  2. Step 2: Convert to fraction form
    128,870/177,840.92 = 75,191.92/x
  3. Step 3: Cross multiply
    128,870x = 177,840.92 × 75,191.92
  4. Step 4: Simplify right side
    128,870x = 13,372,200,229.37
  5. Step 5: Solve for x
    x = 13,372,200,229.37/128,870
  6. Step 6: Final answer
    x = 103,765.04

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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.