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Finding the Fourth Proportional to 283.86, 391.86 and 228.78

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Solution

The fourth proportional to 283.86, 391.86 and 228.78 is: 315.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.86 : 391.86 = 228.78 : x
  2. Step 2: Convert to fraction form
    283.86/391.86 = 228.78/x
  3. Step 3: Cross multiply
    283.86x = 391.86 × 228.78
  4. Step 4: Simplify right side
    283.86x = 89,649.73
  5. Step 5: Solve for x
    x = 89,649.73/283.86
  6. Step 6: Final answer
    x = 315.82

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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.