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Finding the Fourth Proportional to 2.75, 3.80 and 1.67

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Solution

The fourth proportional to 2.75, 3.80 and 1.67 is: 2.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.75 : 3.80 = 1.67 : x
  2. Step 2: Convert to fraction form
    2.75/3.80 = 1.67/x
  3. Step 3: Cross multiply
    2.75x = 3.80 × 1.67
  4. Step 4: Simplify right side
    2.75x = 6.35
  5. Step 5: Solve for x
    x = 6.35/2.75
  6. Step 6: Final answer
    x = 2.31

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Find fourth proportional to 1.38, 1.90 and 0.84
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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.