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Finding the Fourth Proportional to 216.64, 324.94 and 120.44

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Solution

The fourth proportional to 216.64, 324.94 and 120.44 is: 180.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.64 : 324.94 = 120.44 : x
  2. Step 2: Convert to fraction form
    216.64/324.94 = 120.44/x
  3. Step 3: Cross multiply
    216.64x = 324.94 × 120.44
  4. Step 4: Simplify right side
    216.64x = 39,135.77
  5. Step 5: Solve for x
    x = 39,135.77/216.64
  6. Step 6: Final answer
    x = 180.65

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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.