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Finding the Fourth Proportional to 311.28, 427.74 and 259.44

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Solution

The fourth proportional to 311.28, 427.74 and 259.44 is: 356.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.28 : 427.74 = 259.44 : x
  2. Step 2: Convert to fraction form
    311.28/427.74 = 259.44/x
  3. Step 3: Cross multiply
    311.28x = 427.74 × 259.44
  4. Step 4: Simplify right side
    311.28x = 110,972.87
  5. Step 5: Solve for x
    x = 110,972.87/311.28
  6. Step 6: Final answer
    x = 356.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.