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Finding the Fourth Proportional to 9.31, 13.96 and 3.89

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Solution

The fourth proportional to 9.31, 13.96 and 3.89 is: 5.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.31 : 13.96 = 3.89 : x
  2. Step 2: Convert to fraction form
    9.31/13.96 = 3.89/x
  3. Step 3: Cross multiply
    9.31x = 13.96 × 3.89
  4. Step 4: Simplify right side
    9.31x = 54.30
  5. Step 5: Solve for x
    x = 54.30/9.31
  6. Step 6: Final answer
    x = 5.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.