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Finding the Fourth Proportional to 311, 429.38 and 245.40

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Solution

The fourth proportional to 311, 429.38 and 245.40 is: 338.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    311 : 429.38 = 245.40 : x
  2. Step 2: Convert to fraction form
    311/429.38 = 245.40/x
  3. Step 3: Cross multiply
    311x = 429.38 × 245.40
  4. Step 4: Simplify right side
    311x = 105,369.85
  5. Step 5: Solve for x
    x = 105,369.85/311
  6. Step 6: Final answer
    x = 338.81

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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.