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Finding the Fourth Proportional to 167.85, 251.60 and 81.05

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Solution

The fourth proportional to 167.85, 251.60 and 81.05 is: 121.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.85 : 251.60 = 81.05 : x
  2. Step 2: Convert to fraction form
    167.85/251.60 = 81.05/x
  3. Step 3: Cross multiply
    167.85x = 251.60 × 81.05
  4. Step 4: Simplify right side
    167.85x = 20,392.81
  5. Step 5: Solve for x
    x = 20,392.81/167.85
  6. Step 6: Final answer
    x = 121.49

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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.