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Finding the Fourth Proportional to 167.61, 231.39 and 123.42

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Solution

The fourth proportional to 167.61, 231.39 and 123.42 is: 170.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.61 : 231.39 = 123.42 : x
  2. Step 2: Convert to fraction form
    167.61/231.39 = 123.42/x
  3. Step 3: Cross multiply
    167.61x = 231.39 × 123.42
  4. Step 4: Simplify right side
    167.61x = 28,558.15
  5. Step 5: Solve for x
    x = 28,558.15/167.61
  6. Step 6: Final answer
    x = 170.38

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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.