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Finding the Fourth Proportional to 217.36, 326.12 and 89.16

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Solution

The fourth proportional to 217.36, 326.12 and 89.16 is: 133.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.36 : 326.12 = 89.16 : x
  2. Step 2: Convert to fraction form
    217.36/326.12 = 89.16/x
  3. Step 3: Cross multiply
    217.36x = 326.12 × 89.16
  4. Step 4: Simplify right side
    217.36x = 29,076.86
  5. Step 5: Solve for x
    x = 29,076.86/217.36
  6. Step 6: Final answer
    x = 133.77

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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.