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Finding the Fourth Proportional to 167.21, 251.66 and 121.80

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Solution

The fourth proportional to 167.21, 251.66 and 121.80 is: 183.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.21 : 251.66 = 121.80 : x
  2. Step 2: Convert to fraction form
    167.21/251.66 = 121.80/x
  3. Step 3: Cross multiply
    167.21x = 251.66 × 121.80
  4. Step 4: Simplify right side
    167.21x = 30,652.75
  5. Step 5: Solve for x
    x = 30,652.75/167.21
  6. Step 6: Final answer
    x = 183.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.