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Finding the Fourth Proportional to 318.27, 438.98 and 201.87

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Solution

The fourth proportional to 318.27, 438.98 and 201.87 is: 278.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.27 : 438.98 = 201.87 : x
  2. Step 2: Convert to fraction form
    318.27/438.98 = 201.87/x
  3. Step 3: Cross multiply
    318.27x = 438.98 × 201.87
  4. Step 4: Simplify right side
    318.27x = 88,615.88
  5. Step 5: Solve for x
    x = 88,615.88/318.27
  6. Step 6: Final answer
    x = 278.43

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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.