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Finding the Fourth Proportional to 394.20, 543.92 and 228.42

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Solution

The fourth proportional to 394.20, 543.92 and 228.42 is: 315.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.20 : 543.92 = 228.42 : x
  2. Step 2: Convert to fraction form
    394.20/543.92 = 228.42/x
  3. Step 3: Cross multiply
    394.20x = 543.92 × 228.42
  4. Step 4: Simplify right side
    394.20x = 124,242.21
  5. Step 5: Solve for x
    x = 124,242.21/394.20
  6. Step 6: Final answer
    x = 315.18

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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.