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Finding the Fourth Proportional to 167.79, 231.33 and 138.18

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Solution

The fourth proportional to 167.79, 231.33 and 138.18 is: 190.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.79 : 231.33 = 138.18 : x
  2. Step 2: Convert to fraction form
    167.79/231.33 = 138.18/x
  3. Step 3: Cross multiply
    167.79x = 231.33 × 138.18
  4. Step 4: Simplify right side
    167.79x = 31,964.02
  5. Step 5: Solve for x
    x = 31,964.02/167.79
  6. Step 6: Final answer
    x = 190.51

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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.