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Finding the Fourth Proportional to 128,391.73, 192,774.54 and 91,149.55

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Solution

The fourth proportional to 128,391.73, 192,774.54 and 91,149.55 is: 136,857.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,391.73 : 192,774.54 = 91,149.55 : x
  2. Step 2: Convert to fraction form
    128,391.73/192,774.54 = 91,149.55/x
  3. Step 3: Cross multiply
    128,391.73x = 192,774.54 × 91,149.55
  4. Step 4: Simplify right side
    128,391.73x = 17,571,313,054.39
  5. Step 5: Solve for x
    x = 17,571,313,054.39/128,391.73
  6. Step 6: Final answer
    x = 136,857.04

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1.5x scale

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.