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Finding the Fourth Proportional to 311.17, 429.44 and 193.22

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Solution

The fourth proportional to 311.17, 429.44 and 193.22 is: 266.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.17 : 429.44 = 193.22 : x
  2. Step 2: Convert to fraction form
    311.17/429.44 = 193.22/x
  3. Step 3: Cross multiply
    311.17x = 429.44 × 193.22
  4. Step 4: Simplify right side
    311.17x = 82,976.40
  5. Step 5: Solve for x
    x = 82,976.40/311.17
  6. Step 6: Final answer
    x = 266.66

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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.