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Finding the Fourth Proportional to 283.28, 391.08 and 218

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Solution

The fourth proportional to 283.28, 391.08 and 218 is: 300.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.28 : 391.08 = 218 : x
  2. Step 2: Convert to fraction form
    283.28/391.08 = 218/x
  3. Step 3: Cross multiply
    283.28x = 391.08 × 218
  4. Step 4: Simplify right side
    283.28x = 85,255.44
  5. Step 5: Solve for x
    x = 85,255.44/283.28
  6. Step 6: Final answer
    x = 300.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.