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Finding the Fourth Proportional to 217.17, 324.28 and 189.22

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Solution

The fourth proportional to 217.17, 324.28 and 189.22 is: 282.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.17 : 324.28 = 189.22 : x
  2. Step 2: Convert to fraction form
    217.17/324.28 = 189.22/x
  3. Step 3: Cross multiply
    217.17x = 324.28 × 189.22
  4. Step 4: Simplify right side
    217.17x = 61,360.26
  5. Step 5: Solve for x
    x = 61,360.26/217.17
  6. Step 6: Final answer
    x = 282.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.