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Finding the Fourth Proportional to 3,805.67, 5,708.49 and 1,208.81

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Solution

The fourth proportional to 3,805.67, 5,708.49 and 1,208.81 is: 1,813.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,805.67 : 5,708.49 = 1,208.81 : x
  2. Step 2: Convert to fraction form
    3,805.67/5,708.49 = 1,208.81/x
  3. Step 3: Cross multiply
    3,805.67x = 5,708.49 × 1,208.81
  4. Step 4: Simplify right side
    3,805.67x = 6,900,479.80
  5. Step 5: Solve for x
    x = 6,900,479.80/3,805.67
  6. Step 6: Final answer
    x = 1,813.21

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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.