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Finding the Fourth Proportional to 128,413.40, 192,620.10 and 81,872.60

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Solution

The fourth proportional to 128,413.40, 192,620.10 and 81,872.60 is: 122,808.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,413.40 : 192,620.10 = 81,872.60 : x
  2. Step 2: Convert to fraction form
    128,413.40/192,620.10 = 81,872.60/x
  3. Step 3: Cross multiply
    128,413.40x = 192,620.10 × 81,872.60
  4. Step 4: Simplify right side
    128,413.40x = 15,770,308,399.26
  5. Step 5: Solve for x
    x = 15,770,308,399.26/128,413.40
  6. Step 6: Final answer
    x = 122,808.90

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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.