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Finding the Fourth Proportional to 168.26, 232.16 and 128.90

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Solution

The fourth proportional to 168.26, 232.16 and 128.90 is: 177.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.26 : 232.16 = 128.90 : x
  2. Step 2: Convert to fraction form
    168.26/232.16 = 128.90/x
  3. Step 3: Cross multiply
    168.26x = 232.16 × 128.90
  4. Step 4: Simplify right side
    168.26x = 29,925.42
  5. Step 5: Solve for x
    x = 29,925.42/168.26
  6. Step 6: Final answer
    x = 177.85

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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.