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Finding the Fourth Proportional to 216.74, 324.88 and 108.61

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Solution

The fourth proportional to 216.74, 324.88 and 108.61 is: 162.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.74 : 324.88 = 108.61 : x
  2. Step 2: Convert to fraction form
    216.74/324.88 = 108.61/x
  3. Step 3: Cross multiply
    216.74x = 324.88 × 108.61
  4. Step 4: Simplify right side
    216.74x = 35,284.13
  5. Step 5: Solve for x
    x = 35,284.13/216.74
  6. Step 6: Final answer
    x = 162.79

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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.