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Finding the Fourth Proportional to 3.56, 4.90 and 2.79

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Solution

The fourth proportional to 3.56, 4.90 and 2.79 is: 3.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.56 : 4.90 = 2.79 : x
  2. Step 2: Convert to fraction form
    3.56/4.90 = 2.79/x
  3. Step 3: Cross multiply
    3.56x = 4.90 × 2.79
  4. Step 4: Simplify right side
    3.56x = 13.65
  5. Step 5: Solve for x
    x = 13.65/3.56
  6. Step 6: Final answer
    x = 3.84

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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.