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Finding the Fourth Proportional to 217.69, 326.31 and 130.81

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Solution

The fourth proportional to 217.69, 326.31 and 130.81 is: 196.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.69 : 326.31 = 130.81 : x
  2. Step 2: Convert to fraction form
    217.69/326.31 = 130.81/x
  3. Step 3: Cross multiply
    217.69x = 326.31 × 130.81
  4. Step 4: Simplify right side
    217.69x = 42,684.61
  5. Step 5: Solve for x
    x = 42,684.61/217.69
  6. Step 6: Final answer
    x = 196.08

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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.