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Finding the Fourth Proportional to 312.28, 431.02 and 195.96

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Solution

The fourth proportional to 312.28, 431.02 and 195.96 is: 270.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.28 : 431.02 = 195.96 : x
  2. Step 2: Convert to fraction form
    312.28/431.02 = 195.96/x
  3. Step 3: Cross multiply
    312.28x = 431.02 × 195.96
  4. Step 4: Simplify right side
    312.28x = 84,462.68
  5. Step 5: Solve for x
    x = 84,462.68/312.28
  6. Step 6: Final answer
    x = 270.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.