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Finding the Fourth Proportional to 213.14, 319.46 and 161.61

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Solution

The fourth proportional to 213.14, 319.46 and 161.61 is: 242.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.14 : 319.46 = 161.61 : x
  2. Step 2: Convert to fraction form
    213.14/319.46 = 161.61/x
  3. Step 3: Cross multiply
    213.14x = 319.46 × 161.61
  4. Step 4: Simplify right side
    213.14x = 51,627.93
  5. Step 5: Solve for x
    x = 51,627.93/213.14
  6. Step 6: Final answer
    x = 242.23

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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.