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Finding the Fourth Proportional to 287.78, 396.76 and 228.97

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Solution

The fourth proportional to 287.78, 396.76 and 228.97 is: 315.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.78 : 396.76 = 228.97 : x
  2. Step 2: Convert to fraction form
    287.78/396.76 = 228.97/x
  3. Step 3: Cross multiply
    287.78x = 396.76 × 228.97
  4. Step 4: Simplify right side
    287.78x = 90,844.99
  5. Step 5: Solve for x
    x = 90,844.99/287.78
  6. Step 6: Final answer
    x = 315.68

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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.