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Finding the Fourth Proportional to 311.05, 429.25 and 171.17

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Solution

The fourth proportional to 311.05, 429.25 and 171.17 is: 236.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.05 : 429.25 = 171.17 : x
  2. Step 2: Convert to fraction form
    311.05/429.25 = 171.17/x
  3. Step 3: Cross multiply
    311.05x = 429.25 × 171.17
  4. Step 4: Simplify right side
    311.05x = 73,473.87
  5. Step 5: Solve for x
    x = 73,473.87/311.05
  6. Step 6: Final answer
    x = 236.21

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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.