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Finding the Fourth Proportional to 427.37, 639.56 and 311.64

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Solution

The fourth proportional to 427.37, 639.56 and 311.64 is: 466.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.37 : 639.56 = 311.64 : x
  2. Step 2: Convert to fraction form
    427.37/639.56 = 311.64/x
  3. Step 3: Cross multiply
    427.37x = 639.56 × 311.64
  4. Step 4: Simplify right side
    427.37x = 199,310.86
  5. Step 5: Solve for x
    x = 199,310.86/427.37
  6. Step 6: Final answer
    x = 466.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.