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Finding the Fourth Proportional to 167.21, 231.04 and 138.05

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Solution

The fourth proportional to 167.21, 231.04 and 138.05 is: 190.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.21 : 231.04 = 138.05 : x
  2. Step 2: Convert to fraction form
    167.21/231.04 = 138.05/x
  3. Step 3: Cross multiply
    167.21x = 231.04 × 138.05
  4. Step 4: Simplify right side
    167.21x = 31,895.99
  5. Step 5: Solve for x
    x = 31,895.99/167.21
  6. Step 6: Final answer
    x = 190.75

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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.