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Finding the Fourth Proportional to 283.47, 391.85 and 217.86

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Solution

The fourth proportional to 283.47, 391.85 and 217.86 is: 301.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.47 : 391.85 = 217.86 : x
  2. Step 2: Convert to fraction form
    283.47/391.85 = 217.86/x
  3. Step 3: Cross multiply
    283.47x = 391.85 × 217.86
  4. Step 4: Simplify right side
    283.47x = 85,367.35
  5. Step 5: Solve for x
    x = 85,367.35/283.47
  6. Step 6: Final answer
    x = 301.15

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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.