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Finding the Fourth Proportional to 167.57, 251.86 and 138.87

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Solution

The fourth proportional to 167.57, 251.86 and 138.87 is: 208.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.57 : 251.86 = 138.87 : x
  2. Step 2: Convert to fraction form
    167.57/251.86 = 138.87/x
  3. Step 3: Cross multiply
    167.57x = 251.86 × 138.87
  4. Step 4: Simplify right side
    167.57x = 34,975.10
  5. Step 5: Solve for x
    x = 34,975.10/167.57
  6. Step 6: Final answer
    x = 208.72

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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.