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Finding the Fourth Proportional to 228.89, 343.94 and 213.90

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Solution

The fourth proportional to 228.89, 343.94 and 213.90 is: 321.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.89 : 343.94 = 213.90 : x
  2. Step 2: Convert to fraction form
    228.89/343.94 = 213.90/x
  3. Step 3: Cross multiply
    228.89x = 343.94 × 213.90
  4. Step 4: Simplify right side
    228.89x = 73,567.70
  5. Step 5: Solve for x
    x = 73,567.70/228.89
  6. Step 6: Final answer
    x = 321.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.