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Finding the Fourth Proportional to 128,969.12, 193,073.52 and 125,789.60

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Solution

The fourth proportional to 128,969.12, 193,073.52 and 125,789.60 is: 188,313.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,969.12 : 193,073.52 = 125,789.60 : x
  2. Step 2: Convert to fraction form
    128,969.12/193,073.52 = 125,789.60/x
  3. Step 3: Cross multiply
    128,969.12x = 193,073.52 × 125,789.60
  4. Step 4: Simplify right side
    128,969.12x = 24,286,640,851.39
  5. Step 5: Solve for x
    x = 24,286,640,851.39/128,969.12
  6. Step 6: Final answer
    x = 188,313.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.