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Finding the Fourth Proportional to 128.86, 192.96 and 94.54

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Solution

The fourth proportional to 128.86, 192.96 and 94.54 is: 141.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.86 : 192.96 = 94.54 : x
  2. Step 2: Convert to fraction form
    128.86/192.96 = 94.54/x
  3. Step 3: Cross multiply
    128.86x = 192.96 × 94.54
  4. Step 4: Simplify right side
    128.86x = 18,242.44
  5. Step 5: Solve for x
    x = 18,242.44/128.86
  6. Step 6: Final answer
    x = 141.57

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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.