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Finding the Fourth Proportional to 128,400.90, 192,759.30 and 81,015.90

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Solution

The fourth proportional to 128,400.90, 192,759.30 and 81,015.90 is: 121,623.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,400.90 : 192,759.30 = 81,015.90 : x
  2. Step 2: Convert to fraction form
    128,400.90/192,759.30 = 81,015.90/x
  3. Step 3: Cross multiply
    128,400.90x = 192,759.30 × 81,015.90
  4. Step 4: Simplify right side
    128,400.90x = 15,616,568,172.87
  5. Step 5: Solve for x
    x = 15,616,568,172.87/128,400.90
  6. Step 6: Final answer
    x = 121,623.51

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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.