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Finding the Fourth Proportional to 3.25, 4.90 and 3.09

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Solution

The fourth proportional to 3.25, 4.90 and 3.09 is: 4.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.25 : 4.90 = 3.09 : x
  2. Step 2: Convert to fraction form
    3.25/4.90 = 3.09/x
  3. Step 3: Cross multiply
    3.25x = 4.90 × 3.09
  4. Step 4: Simplify right side
    3.25x = 15.14
  5. Step 5: Solve for x
    x = 15.14/3.25
  6. Step 6: Final answer
    x = 4.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.