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Finding the Fourth Proportional to 3.93, 5.42 and 2.31

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Solution

The fourth proportional to 3.93, 5.42 and 2.31 is: 3.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.93 : 5.42 = 2.31 : x
  2. Step 2: Convert to fraction form
    3.93/5.42 = 2.31/x
  3. Step 3: Cross multiply
    3.93x = 5.42 × 2.31
  4. Step 4: Simplify right side
    3.93x = 12.54
  5. Step 5: Solve for x
    x = 12.54/3.93
  6. Step 6: Final answer
    x = 3.19

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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.