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Finding the Fourth Proportional to 311.22, 429.48 and 171.35

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Solution

The fourth proportional to 311.22, 429.48 and 171.35 is: 236.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.22 : 429.48 = 171.35 : x
  2. Step 2: Convert to fraction form
    311.22/429.48 = 171.35/x
  3. Step 3: Cross multiply
    311.22x = 429.48 × 171.35
  4. Step 4: Simplify right side
    311.22x = 73,589.25
  5. Step 5: Solve for x
    x = 73,589.25/311.22
  6. Step 6: Final answer
    x = 236.45

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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.