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Finding the Fourth Proportional to 5.09, 7.61 and 3.81

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Solution

The fourth proportional to 5.09, 7.61 and 3.81 is: 5.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.09 : 7.61 = 3.81 : x
  2. Step 2: Convert to fraction form
    5.09/7.61 = 3.81/x
  3. Step 3: Cross multiply
    5.09x = 7.61 × 3.81
  4. Step 4: Simplify right side
    5.09x = 29.00
  5. Step 5: Solve for x
    x = 29.00/5.09
  6. Step 6: Final answer
    x = 5.70

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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.