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Finding the Fourth Proportional to 168.71, 252.86 and 91.67

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Solution

The fourth proportional to 168.71, 252.86 and 91.67 is: 137.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.71 : 252.86 = 91.67 : x
  2. Step 2: Convert to fraction form
    168.71/252.86 = 91.67/x
  3. Step 3: Cross multiply
    168.71x = 252.86 × 91.67
  4. Step 4: Simplify right side
    168.71x = 23,177.95
  5. Step 5: Solve for x
    x = 23,177.95/168.71
  6. Step 6: Final answer
    x = 137.39

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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.