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Finding the Fourth Proportional to 3,813.65, 5,721.02 and 1,865.96

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Solution

The fourth proportional to 3,813.65, 5,721.02 and 1,865.96 is: 2,799.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,813.65 : 5,721.02 = 1,865.96 : x
  2. Step 2: Convert to fraction form
    3,813.65/5,721.02 = 1,865.96/x
  3. Step 3: Cross multiply
    3,813.65x = 5,721.02 × 1,865.96
  4. Step 4: Simplify right side
    3,813.65x = 10,675,185.15
  5. Step 5: Solve for x
    x = 10,675,185.15/3,813.65
  6. Step 6: Final answer
    x = 2,799.20

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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.