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Finding the Fourth Proportional to 167.86, 231.42 and 128.58

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Solution

The fourth proportional to 167.86, 231.42 and 128.58 is: 177.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.86 : 231.42 = 128.58 : x
  2. Step 2: Convert to fraction form
    167.86/231.42 = 128.58/x
  3. Step 3: Cross multiply
    167.86x = 231.42 × 128.58
  4. Step 4: Simplify right side
    167.86x = 29,755.98
  5. Step 5: Solve for x
    x = 29,755.98/167.86
  6. Step 6: Final answer
    x = 177.27

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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.