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Finding the Fourth Proportional to 318.44, 439.38 and 201.94

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Solution

The fourth proportional to 318.44, 439.38 and 201.94 is: 278.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.44 : 439.38 = 201.94 : x
  2. Step 2: Convert to fraction form
    318.44/439.38 = 201.94/x
  3. Step 3: Cross multiply
    318.44x = 439.38 × 201.94
  4. Step 4: Simplify right side
    318.44x = 88,728.40
  5. Step 5: Solve for x
    x = 88,728.40/318.44
  6. Step 6: Final answer
    x = 278.63

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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.