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Finding the Fourth Proportional to 228.75, 343.07 and 84.39

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Solution

The fourth proportional to 228.75, 343.07 and 84.39 is: 126.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.75 : 343.07 = 84.39 : x
  2. Step 2: Convert to fraction form
    228.75/343.07 = 84.39/x
  3. Step 3: Cross multiply
    228.75x = 343.07 × 84.39
  4. Step 4: Simplify right side
    228.75x = 28,951.68
  5. Step 5: Solve for x
    x = 28,951.68/228.75
  6. Step 6: Final answer
    x = 126.56

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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.