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Finding the Fourth Proportional to 166.49, 249.74 and 79.86

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Solution

The fourth proportional to 166.49, 249.74 and 79.86 is: 119.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.49 : 249.74 = 79.86 : x
  2. Step 2: Convert to fraction form
    166.49/249.74 = 79.86/x
  3. Step 3: Cross multiply
    166.49x = 249.74 × 79.86
  4. Step 4: Simplify right side
    166.49x = 19,944.12
  5. Step 5: Solve for x
    x = 19,944.12/166.49
  6. Step 6: Final answer
    x = 119.79

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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.