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Finding the Fourth Proportional to 272.78, 376.28 and 198.98

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Solution

The fourth proportional to 272.78, 376.28 and 198.98 is: 274.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.78 : 376.28 = 198.98 : x
  2. Step 2: Convert to fraction form
    272.78/376.28 = 198.98/x
  3. Step 3: Cross multiply
    272.78x = 376.28 × 198.98
  4. Step 4: Simplify right side
    272.78x = 74,872.19
  5. Step 5: Solve for x
    x = 74,872.19/272.78
  6. Step 6: Final answer
    x = 274.48

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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.