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Finding the Fourth Proportional to 394.78, 544.71 and 228.97

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Solution

The fourth proportional to 394.78, 544.71 and 228.97 is: 315.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.78 : 544.71 = 228.97 : x
  2. Step 2: Convert to fraction form
    394.78/544.71 = 228.97/x
  3. Step 3: Cross multiply
    394.78x = 544.71 × 228.97
  4. Step 4: Simplify right side
    394.78x = 124,720.97
  5. Step 5: Solve for x
    x = 124,720.97/394.78
  6. Step 6: Final answer
    x = 315.93

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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.