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Finding the Fourth Proportional to 217.20, 326.98 and 187.44

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Solution

The fourth proportional to 217.20, 326.98 and 187.44 is: 282.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.20 : 326.98 = 187.44 : x
  2. Step 2: Convert to fraction form
    217.20/326.98 = 187.44/x
  3. Step 3: Cross multiply
    217.20x = 326.98 × 187.44
  4. Step 4: Simplify right side
    217.20x = 61,289.13
  5. Step 5: Solve for x
    x = 61,289.13/217.20
  6. Step 6: Final answer
    x = 282.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.