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Finding the Fourth Proportional to 3.86, 5.32 and 2.78

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Solution

The fourth proportional to 3.86, 5.32 and 2.78 is: 3.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.86 : 5.32 = 2.78 : x
  2. Step 2: Convert to fraction form
    3.86/5.32 = 2.78/x
  3. Step 3: Cross multiply
    3.86x = 5.32 × 2.78
  4. Step 4: Simplify right side
    3.86x = 14.79
  5. Step 5: Solve for x
    x = 14.79/3.86
  6. Step 6: Final answer
    x = 3.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.