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Finding the Fourth Proportional to 216.94, 325.20 and 108.64

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Solution

The fourth proportional to 216.94, 325.20 and 108.64 is: 162.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.94 : 325.20 = 108.64 : x
  2. Step 2: Convert to fraction form
    216.94/325.20 = 108.64/x
  3. Step 3: Cross multiply
    216.94x = 325.20 × 108.64
  4. Step 4: Simplify right side
    216.94x = 35,329.73
  5. Step 5: Solve for x
    x = 35,329.73/216.94
  6. Step 6: Final answer
    x = 162.85

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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.