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Finding the Fourth Proportional to 213.98, 321.54 and 122.75

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Solution

The fourth proportional to 213.98, 321.54 and 122.75 is: 184.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.98 : 321.54 = 122.75 : x
  2. Step 2: Convert to fraction form
    213.98/321.54 = 122.75/x
  3. Step 3: Cross multiply
    213.98x = 321.54 × 122.75
  4. Step 4: Simplify right side
    213.98x = 39,469.04
  5. Step 5: Solve for x
    x = 39,469.04/213.98
  6. Step 6: Final answer
    x = 184.45

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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.