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Finding the Fourth Proportional to 311.32, 429.62 and 171.43

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Solution

The fourth proportional to 311.32, 429.62 and 171.43 is: 236.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.32 : 429.62 = 171.43 : x
  2. Step 2: Convert to fraction form
    311.32/429.62 = 171.43/x
  3. Step 3: Cross multiply
    311.32x = 429.62 × 171.43
  4. Step 4: Simplify right side
    311.32x = 73,648.90
  5. Step 5: Solve for x
    x = 73,648.90/311.32
  6. Step 6: Final answer
    x = 236.57

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