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Finding the Fourth Proportional to 128,003.40, 192,005.10 and 115,318.80

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Solution

The fourth proportional to 128,003.40, 192,005.10 and 115,318.80 is: 172,978.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,003.40 : 192,005.10 = 115,318.80 : x
  2. Step 2: Convert to fraction form
    128,003.40/192,005.10 = 115,318.80/x
  3. Step 3: Cross multiply
    128,003.40x = 192,005.10 × 115,318.80
  4. Step 4: Simplify right side
    128,003.40x = 22,141,797,725.88
  5. Step 5: Solve for x
    x = 22,141,797,725.88/128,003.40
  6. Step 6: Final answer
    x = 172,978.20

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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.