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Finding the Fourth Proportional to 311.81, 467.38 and 106.30

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Solution

The fourth proportional to 311.81, 467.38 and 106.30 is: 159.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.81 : 467.38 = 106.30 : x
  2. Step 2: Convert to fraction form
    311.81/467.38 = 106.30/x
  3. Step 3: Cross multiply
    311.81x = 467.38 × 106.30
  4. Step 4: Simplify right side
    311.81x = 49,683.21
  5. Step 5: Solve for x
    x = 49,683.21/311.81
  6. Step 6: Final answer
    x = 159.34

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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.