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Finding the Fourth Proportional to 4.09, 5.65 and 2.79

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Solution

The fourth proportional to 4.09, 5.65 and 2.79 is: 3.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.09 : 5.65 = 2.79 : x
  2. Step 2: Convert to fraction form
    4.09/5.65 = 2.79/x
  3. Step 3: Cross multiply
    4.09x = 5.65 × 2.79
  4. Step 4: Simplify right side
    4.09x = 15.77
  5. Step 5: Solve for x
    x = 15.77/4.09
  6. Step 6: Final answer
    x = 3.86

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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.