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Finding the Fourth Proportional to 311.81, 430.31 and 171.94

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Solution

The fourth proportional to 311.81, 430.31 and 171.94 is: 237.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.81 : 430.31 = 171.94 : x
  2. Step 2: Convert to fraction form
    311.81/430.31 = 171.94/x
  3. Step 3: Cross multiply
    311.81x = 430.31 × 171.94
  4. Step 4: Simplify right side
    311.81x = 73,985.57
  5. Step 5: Solve for x
    x = 73,985.57/311.81
  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.