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Finding the Fourth Proportional to 166.21, 249.21 and 79.43

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Solution

The fourth proportional to 166.21, 249.21 and 79.43 is: 119.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.21 : 249.21 = 79.43 : x
  2. Step 2: Convert to fraction form
    166.21/249.21 = 79.43/x
  3. Step 3: Cross multiply
    166.21x = 249.21 × 79.43
  4. Step 4: Simplify right side
    166.21x = 19,794.75
  5. Step 5: Solve for x
    x = 19,794.75/166.21
  6. Step 6: Final answer
    x = 119.09

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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.