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Finding the Fourth Proportional to 121.87, 167.09 and 119.68

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Solution

The fourth proportional to 121.87, 167.09 and 119.68 is: 164.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.87 : 167.09 = 119.68 : x
  2. Step 2: Convert to fraction form
    121.87/167.09 = 119.68/x
  3. Step 3: Cross multiply
    121.87x = 167.09 × 119.68
  4. Step 4: Simplify right side
    121.87x = 19,996.94
  5. Step 5: Solve for x
    x = 19,996.94/121.87
  6. Step 6: Final answer
    x = 164.09

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.