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Finding the Fourth Proportional to 3.86, 5.79 and 3.64

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Solution

The fourth proportional to 3.86, 5.79 and 3.64 is: 5.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.86 : 5.79 = 3.64 : x
  2. Step 2: Convert to fraction form
    3.86/5.79 = 3.64/x
  3. Step 3: Cross multiply
    3.86x = 5.79 × 3.64
  4. Step 4: Simplify right side
    3.86x = 21.06
  5. Step 5: Solve for x
    x = 21.06/3.86
  6. Step 6: Final answer
    x = 5.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.