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Finding the Fourth Proportional to 167.83, 231.63 and 128.42

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Solution

The fourth proportional to 167.83, 231.63 and 128.42 is: 177.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.83 : 231.63 = 128.42 : x
  2. Step 2: Convert to fraction form
    167.83/231.63 = 128.42/x
  3. Step 3: Cross multiply
    167.83x = 231.63 × 128.42
  4. Step 4: Simplify right side
    167.83x = 29,745.92
  5. Step 5: Solve for x
    x = 29,745.92/167.83
  6. Step 6: Final answer
    x = 177.24

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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.