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Finding the Fourth Proportional to 167.68, 231.38 and 128.80

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Solution

The fourth proportional to 167.68, 231.38 and 128.80 is: 177.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.68 : 231.38 = 128.80 : x
  2. Step 2: Convert to fraction form
    167.68/231.38 = 128.80/x
  3. Step 3: Cross multiply
    167.68x = 231.38 × 128.80
  4. Step 4: Simplify right side
    167.68x = 29,801.74
  5. Step 5: Solve for x
    x = 29,801.74/167.68
  6. Step 6: Final answer
    x = 177.73

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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.