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Finding the Fourth Proportional to 216.28, 324.51 and 129.61

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Solution

The fourth proportional to 216.28, 324.51 and 129.61 is: 194.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.28 : 324.51 = 129.61 : x
  2. Step 2: Convert to fraction form
    216.28/324.51 = 129.61/x
  3. Step 3: Cross multiply
    216.28x = 324.51 × 129.61
  4. Step 4: Simplify right side
    216.28x = 42,059.74
  5. Step 5: Solve for x
    x = 42,059.74/216.28
  6. Step 6: Final answer
    x = 194.47

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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.