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Finding the Fourth Proportional to 2.63, 3.92 and 2.20

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Solution

The fourth proportional to 2.63, 3.92 and 2.20 is: 3.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.63 : 3.92 = 2.20 : x
  2. Step 2: Convert to fraction form
    2.63/3.92 = 2.20/x
  3. Step 3: Cross multiply
    2.63x = 3.92 × 2.20
  4. Step 4: Simplify right side
    2.63x = 8.60
  5. Step 5: Solve for x
    x = 8.60/2.63
  6. Step 6: Final answer
    x = 3.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.