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Finding the Fourth Proportional to 3,886.74, 5,821.85 and 3,143.16

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Solution

The fourth proportional to 3,886.74, 5,821.85 and 3,143.16 is: 4,708.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.74 : 5,821.85 = 3,143.16 : x
  2. Step 2: Convert to fraction form
    3,886.74/5,821.85 = 3,143.16/x
  3. Step 3: Cross multiply
    3,886.74x = 5,821.85 × 3,143.16
  4. Step 4: Simplify right side
    3,886.74x = 18,299,006.05
  5. Step 5: Solve for x
    x = 18,299,006.05/3,886.74
  6. Step 6: Final answer
    x = 4,708.06

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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.