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Finding the Fourth Proportional to 213.99, 321.06 and 111.23

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Solution

The fourth proportional to 213.99, 321.06 and 111.23 is: 166.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.99 : 321.06 = 111.23 : x
  2. Step 2: Convert to fraction form
    213.99/321.06 = 111.23/x
  3. Step 3: Cross multiply
    213.99x = 321.06 × 111.23
  4. Step 4: Simplify right side
    213.99x = 35,709.90
  5. Step 5: Solve for x
    x = 35,709.90/213.99
  6. Step 6: Final answer
    x = 166.88

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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.