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Finding the Fourth Proportional to 2.22, 2.99 and 2.21

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Solution

The fourth proportional to 2.22, 2.99 and 2.21 is: 2.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.22 : 2.99 = 2.21 : x
  2. Step 2: Convert to fraction form
    2.22/2.99 = 2.21/x
  3. Step 3: Cross multiply
    2.22x = 2.99 × 2.21
  4. Step 4: Simplify right side
    2.22x = 6.61
  5. Step 5: Solve for x
    x = 6.61/2.22
  6. Step 6: Final answer
    x = 2.98

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.