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Finding the Fourth Proportional to 3.13, 4.31 and 2.11

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Solution

The fourth proportional to 3.13, 4.31 and 2.11 is: 2.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.13 : 4.31 = 2.11 : x
  2. Step 2: Convert to fraction form
    3.13/4.31 = 2.11/x
  3. Step 3: Cross multiply
    3.13x = 4.31 × 2.11
  4. Step 4: Simplify right side
    3.13x = 9.10
  5. Step 5: Solve for x
    x = 9.10/3.13
  6. Step 6: Final answer
    x = 2.90

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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.