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Finding the Fourth Proportional to 2.12, 2.90 and 1.91

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Solution

The fourth proportional to 2.12, 2.90 and 1.91 is: 2.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.12 : 2.90 = 1.91 : x
  2. Step 2: Convert to fraction form
    2.12/2.90 = 1.91/x
  3. Step 3: Cross multiply
    2.12x = 2.90 × 1.91
  4. Step 4: Simplify right side
    2.12x = 5.54
  5. Step 5: Solve for x
    x = 5.54/2.12
  6. Step 6: Final answer
    x = 2.62

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.