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Finding the Fourth Proportional to 394.20, 543.93 and 228.35

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Solution

The fourth proportional to 394.20, 543.93 and 228.35 is: 315.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.20 : 543.93 = 228.35 : x
  2. Step 2: Convert to fraction form
    394.20/543.93 = 228.35/x
  3. Step 3: Cross multiply
    394.20x = 543.93 × 228.35
  4. Step 4: Simplify right side
    394.20x = 124,206.92
  5. Step 5: Solve for x
    x = 124,206.92/394.20
  6. Step 6: Final answer
    x = 315.09

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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.