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Finding the Fourth Proportional to 212.11, 318.22 and 67.84

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Solution

The fourth proportional to 212.11, 318.22 and 67.84 is: 101.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.11 : 318.22 = 67.84 : x
  2. Step 2: Convert to fraction form
    212.11/318.22 = 67.84/x
  3. Step 3: Cross multiply
    212.11x = 318.22 × 67.84
  4. Step 4: Simplify right side
    212.11x = 21,586.28
  5. Step 5: Solve for x
    x = 21,586.28/212.11
  6. Step 6: Final answer
    x = 101.77

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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.