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Finding the Fourth Proportional to 217.40, 326.24 and 163.40

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Solution

The fourth proportional to 217.40, 326.24 and 163.40 is: 245.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.40 : 326.24 = 163.40 : x
  2. Step 2: Convert to fraction form
    217.40/326.24 = 163.40/x
  3. Step 3: Cross multiply
    217.40x = 326.24 × 163.40
  4. Step 4: Simplify right side
    217.40x = 53,307.62
  5. Step 5: Solve for x
    x = 53,307.62/217.40
  6. Step 6: Final answer
    x = 245.21

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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.