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Finding the Fourth Proportional to 139.05, 192.38 and 129.33

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Solution

The fourth proportional to 139.05, 192.38 and 129.33 is: 178.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.05 : 192.38 = 129.33 : x
  2. Step 2: Convert to fraction form
    139.05/192.38 = 129.33/x
  3. Step 3: Cross multiply
    139.05x = 192.38 × 129.33
  4. Step 4: Simplify right side
    139.05x = 24,879.86
  5. Step 5: Solve for x
    x = 24,879.86/139.05
  6. Step 6: Final answer
    x = 178.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.