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Finding the Fourth Proportional to 213.12, 318.14 and 197.68

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Solution

The fourth proportional to 213.12, 318.14 and 197.68 is: 295.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.12 : 318.14 = 197.68 : x
  2. Step 2: Convert to fraction form
    213.12/318.14 = 197.68/x
  3. Step 3: Cross multiply
    213.12x = 318.14 × 197.68
  4. Step 4: Simplify right side
    213.12x = 62,889.92
  5. Step 5: Solve for x
    x = 62,889.92/213.12
  6. Step 6: Final answer
    x = 295.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.