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Finding the Fourth Proportional to 128,112.80, 192,169.20 and 81,456.80

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Solution

The fourth proportional to 128,112.80, 192,169.20 and 81,456.80 is: 122,185.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,112.80 : 192,169.20 = 81,456.80 : x
  2. Step 2: Convert to fraction form
    128,112.80/192,169.20 = 81,456.80/x
  3. Step 3: Cross multiply
    128,112.80x = 192,169.20 × 81,456.80
  4. Step 4: Simplify right side
    128,112.80x = 15,653,488,090.56
  5. Step 5: Solve for x
    x = 15,653,488,090.56/128,112.80
  6. Step 6: Final answer
    x = 122,185.20

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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.