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Finding the Fourth Proportional to 331.28, 457.20 and 228

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Solution

The fourth proportional to 331.28, 457.20 and 228 is: 314.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.28 : 457.20 = 228 : x
  2. Step 2: Convert to fraction form
    331.28/457.20 = 228/x
  3. Step 3: Cross multiply
    331.28x = 457.20 × 228
  4. Step 4: Simplify right side
    331.28x = 104,241.60
  5. Step 5: Solve for x
    x = 104,241.60/331.28
  6. Step 6: Final answer
    x = 314.66

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