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Finding the Fourth Proportional to 216, 324.18 and 119.79

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Solution

The fourth proportional to 216, 324.18 and 119.79 is: 179.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    216 : 324.18 = 119.79 : x
  2. Step 2: Convert to fraction form
    216/324.18 = 119.79/x
  3. Step 3: Cross multiply
    216x = 324.18 × 119.79
  4. Step 4: Simplify right side
    216x = 38,833.52
  5. Step 5: Solve for x
    x = 38,833.52/216
  6. Step 6: Final answer
    x = 179.78

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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.