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Finding the Fourth Proportional to 128,793.60, 177,739.79 and 75,069.95

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Solution

The fourth proportional to 128,793.60, 177,739.79 and 75,069.95 is: 103,599.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,793.60 : 177,739.79 = 75,069.95 : x
  2. Step 2: Convert to fraction form
    128,793.60/177,739.79 = 75,069.95/x
  3. Step 3: Cross multiply
    128,793.60x = 177,739.79 × 75,069.95
  4. Step 4: Simplify right side
    128,793.60x = 13,342,915,884.26
  5. Step 5: Solve for x
    x = 13,342,915,884.26/128,793.60
  6. Step 6: Final answer
    x = 103,599.22

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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.