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Finding the Fourth Proportional to 394.09, 543.87 and 228.36

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Solution

The fourth proportional to 394.09, 543.87 and 228.36 is: 315.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.09 : 543.87 = 228.36 : x
  2. Step 2: Convert to fraction form
    394.09/543.87 = 228.36/x
  3. Step 3: Cross multiply
    394.09x = 543.87 × 228.36
  4. Step 4: Simplify right side
    394.09x = 124,195.26
  5. Step 5: Solve for x
    x = 124,195.26/394.09
  6. Step 6: Final answer
    x = 315.15

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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.