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Finding the Fourth Proportional to 213.75, 321.24 and 105.61

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Solution

The fourth proportional to 213.75, 321.24 and 105.61 is: 158.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.75 : 321.24 = 105.61 : x
  2. Step 2: Convert to fraction form
    213.75/321.24 = 105.61/x
  3. Step 3: Cross multiply
    213.75x = 321.24 × 105.61
  4. Step 4: Simplify right side
    213.75x = 33,926.16
  5. Step 5: Solve for x
    x = 33,926.16/213.75
  6. Step 6: Final answer
    x = 158.72

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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.