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Finding the Fourth Proportional to 318.38, 439.28 and 201.86

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Solution

The fourth proportional to 318.38, 439.28 and 201.86 is: 278.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.38 : 439.28 = 201.86 : x
  2. Step 2: Convert to fraction form
    318.38/439.28 = 201.86/x
  3. Step 3: Cross multiply
    318.38x = 439.28 × 201.86
  4. Step 4: Simplify right side
    318.38x = 88,673.06
  5. Step 5: Solve for x
    x = 88,673.06/318.38
  6. Step 6: Final answer
    x = 278.51

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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.