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Finding the Fourth Proportional to 217.40, 325.91 and 126.18

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Solution

The fourth proportional to 217.40, 325.91 and 126.18 is: 189.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.40 : 325.91 = 126.18 : x
  2. Step 2: Convert to fraction form
    217.40/325.91 = 126.18/x
  3. Step 3: Cross multiply
    217.40x = 325.91 × 126.18
  4. Step 4: Simplify right side
    217.40x = 41,122.69
  5. Step 5: Solve for x
    x = 41,122.69/217.40
  6. Step 6: Final answer
    x = 189.16

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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.