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Finding the Fourth Proportional to 128,108.80, 192,163.20 and 115,667.20

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Solution

The fourth proportional to 128,108.80, 192,163.20 and 115,667.20 is: 173,500.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,108.80 : 192,163.20 = 115,667.20 : x
  2. Step 2: Convert to fraction form
    128,108.80/192,163.20 = 115,667.20/x
  3. Step 3: Cross multiply
    128,108.80x = 192,163.20 × 115,667.20
  4. Step 4: Simplify right side
    128,108.80x = 22,226,979,287.04
  5. Step 5: Solve for x
    x = 22,226,979,287.04/128,108.80
  6. Step 6: Final answer
    x = 173,500.80

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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.