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Finding the Fourth Proportional to 4.22, 6.38 and 4.02

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Solution

The fourth proportional to 4.22, 6.38 and 4.02 is: 6.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.22 : 6.38 = 4.02 : x
  2. Step 2: Convert to fraction form
    4.22/6.38 = 4.02/x
  3. Step 3: Cross multiply
    4.22x = 6.38 × 4.02
  4. Step 4: Simplify right side
    4.22x = 25.65
  5. Step 5: Solve for x
    x = 25.65/4.22
  6. Step 6: Final answer
    x = 6.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.