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Finding the Fourth Proportional to 394.21, 543.79 and 228.40

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Solution

The fourth proportional to 394.21, 543.79 and 228.40 is: 315.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.21 : 543.79 = 228.40 : x
  2. Step 2: Convert to fraction form
    394.21/543.79 = 228.40/x
  3. Step 3: Cross multiply
    394.21x = 543.79 × 228.40
  4. Step 4: Simplify right side
    394.21x = 124,201.83
  5. Step 5: Solve for x
    x = 124,201.83/394.21
  6. Step 6: Final answer
    x = 315.06

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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.