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Finding the Fourth Proportional to 167.68, 231.28 and 153.91

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Solution

The fourth proportional to 167.68, 231.28 and 153.91 is: 212.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.68 : 231.28 = 153.91 : x
  2. Step 2: Convert to fraction form
    167.68/231.28 = 153.91/x
  3. Step 3: Cross multiply
    167.68x = 231.28 × 153.91
  4. Step 4: Simplify right side
    167.68x = 35,596.30
  5. Step 5: Solve for x
    x = 35,596.30/167.68
  6. Step 6: Final answer
    x = 212.29

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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.