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Finding the Fourth Proportional to 311.85, 430.31 and 171.96

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Solution

The fourth proportional to 311.85, 430.31 and 171.96 is: 237.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.85 : 430.31 = 171.96 : x
  2. Step 2: Convert to fraction form
    311.85/430.31 = 171.96/x
  3. Step 3: Cross multiply
    311.85x = 430.31 × 171.96
  4. Step 4: Simplify right side
    311.85x = 73,995.25
  5. Step 5: Solve for x
    x = 73,995.25/311.85
  6. Step 6: Final answer
    x = 237.28

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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.