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Finding the Fourth Proportional to 2.83, 3.90 and 2.13

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Solution

The fourth proportional to 2.83, 3.90 and 2.13 is: 2.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.83 : 3.90 = 2.13 : x
  2. Step 2: Convert to fraction form
    2.83/3.90 = 2.13/x
  3. Step 3: Cross multiply
    2.83x = 3.90 × 2.13
  4. Step 4: Simplify right side
    2.83x = 8.30
  5. Step 5: Solve for x
    x = 8.30/2.83
  6. Step 6: Final answer
    x = 2.94

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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.