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Finding the Fourth Proportional to 311.22, 465.75 and 275.22

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Solution

The fourth proportional to 311.22, 465.75 and 275.22 is: 411.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.22 : 465.75 = 275.22 : x
  2. Step 2: Convert to fraction form
    311.22/465.75 = 275.22/x
  3. Step 3: Cross multiply
    311.22x = 465.75 × 275.22
  4. Step 4: Simplify right side
    311.22x = 128,183.72
  5. Step 5: Solve for x
    x = 128,183.72/311.22
  6. Step 6: Final answer
    x = 411.87

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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.