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Finding the Fourth Proportional to 2.85, 3.93 and 2.04

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Solution

The fourth proportional to 2.85, 3.93 and 2.04 is: 2.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.85 : 3.93 = 2.04 : x
  2. Step 2: Convert to fraction form
    2.85/3.93 = 2.04/x
  3. Step 3: Cross multiply
    2.85x = 3.93 × 2.04
  4. Step 4: Simplify right side
    2.85x = 7.99
  5. Step 5: Solve for x
    x = 7.99/2.85
  6. Step 6: Final answer
    x = 2.81

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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.