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Finding the Fourth Proportional to 3.54, 4.91 and 3.31

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Solution

The fourth proportional to 3.54, 4.91 and 3.31 is: 4.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.54 : 4.91 = 3.31 : x
  2. Step 2: Convert to fraction form
    3.54/4.91 = 3.31/x
  3. Step 3: Cross multiply
    3.54x = 4.91 × 3.31
  4. Step 4: Simplify right side
    3.54x = 16.24
  5. Step 5: Solve for x
    x = 16.24/3.54
  6. Step 6: Final answer
    x = 4.59

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.