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Finding the Fourth Proportional to 311.32, 467.18 and 208.86

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Solution

The fourth proportional to 311.32, 467.18 and 208.86 is: 313.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.32 : 467.18 = 208.86 : x
  2. Step 2: Convert to fraction form
    311.32/467.18 = 208.86/x
  3. Step 3: Cross multiply
    311.32x = 467.18 × 208.86
  4. Step 4: Simplify right side
    311.32x = 97,575.21
  5. Step 5: Solve for x
    x = 97,575.21/311.32
  6. Step 6: Final answer
    x = 313.42

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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.