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Finding the Fourth Proportional to 217.40, 326 and 73.08

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Solution

The fourth proportional to 217.40, 326 and 73.08 is: 109.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.40 : 326 = 73.08 : x
  2. Step 2: Convert to fraction form
    217.40/326 = 73.08/x
  3. Step 3: Cross multiply
    217.40x = 326 × 73.08
  4. Step 4: Simplify right side
    217.40x = 23,824.08
  5. Step 5: Solve for x
    x = 23,824.08/217.40
  6. Step 6: Final answer
    x = 109.59

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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.