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Finding the Fourth Proportional to 128.35, 192.25 and 104.05

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Solution

The fourth proportional to 128.35, 192.25 and 104.05 is: 155.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.35 : 192.25 = 104.05 : x
  2. Step 2: Convert to fraction form
    128.35/192.25 = 104.05/x
  3. Step 3: Cross multiply
    128.35x = 192.25 × 104.05
  4. Step 4: Simplify right side
    128.35x = 20,003.61
  5. Step 5: Solve for x
    x = 20,003.61/128.35
  6. Step 6: Final answer
    x = 155.85

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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.