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Finding the Fourth Proportional to 4.16, 6.21 and 3.86

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Solution

The fourth proportional to 4.16, 6.21 and 3.86 is: 5.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.16 : 6.21 = 3.86 : x
  2. Step 2: Convert to fraction form
    4.16/6.21 = 3.86/x
  3. Step 3: Cross multiply
    4.16x = 6.21 × 3.86
  4. Step 4: Simplify right side
    4.16x = 23.97
  5. Step 5: Solve for x
    x = 23.97/4.16
  6. Step 6: Final answer
    x = 5.76

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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.