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Finding the Fourth Proportional to 4.20, 6.27 and 3.79

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Solution

The fourth proportional to 4.20, 6.27 and 3.79 is: 5.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.20 : 6.27 = 3.79 : x
  2. Step 2: Convert to fraction form
    4.20/6.27 = 3.79/x
  3. Step 3: Cross multiply
    4.20x = 6.27 × 3.79
  4. Step 4: Simplify right side
    4.20x = 23.73
  5. Step 5: Solve for x
    x = 23.73/4.20
  6. Step 6: Final answer
    x = 5.65

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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.