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Finding the Fourth Proportional to 216.10, 299.78 and 196.66

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Solution

The fourth proportional to 216.10, 299.78 and 196.66 is: 272.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.10 : 299.78 = 196.66 : x
  2. Step 2: Convert to fraction form
    216.10/299.78 = 196.66/x
  3. Step 3: Cross multiply
    216.10x = 299.78 × 196.66
  4. Step 4: Simplify right side
    216.10x = 58,954.73
  5. Step 5: Solve for x
    x = 58,954.73/216.10
  6. Step 6: Final answer
    x = 272.81

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.