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Finding the Fourth Proportional to 128.86, 192.17 and 118.36

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Solution

The fourth proportional to 128.86, 192.17 and 118.36 is: 176.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.86 : 192.17 = 118.36 : x
  2. Step 2: Convert to fraction form
    128.86/192.17 = 118.36/x
  3. Step 3: Cross multiply
    128.86x = 192.17 × 118.36
  4. Step 4: Simplify right side
    128.86x = 22,745.24
  5. Step 5: Solve for x
    x = 22,745.24/128.86
  6. Step 6: Final answer
    x = 176.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.