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Finding the Fourth Proportional to 311.67, 427.81 and 298.31

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Solution

The fourth proportional to 311.67, 427.81 and 298.31 is: 409.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.67 : 427.81 = 298.31 : x
  2. Step 2: Convert to fraction form
    311.67/427.81 = 298.31/x
  3. Step 3: Cross multiply
    311.67x = 427.81 × 298.31
  4. Step 4: Simplify right side
    311.67x = 127,618.04
  5. Step 5: Solve for x
    x = 127,618.04/311.67
  6. Step 6: Final answer
    x = 409.46

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.