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Finding the Fourth Proportional to 3,684.75, 5,085 and 2,112.90

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Solution

The fourth proportional to 3,684.75, 5,085 and 2,112.90 is: 2,915.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,684.75 : 5,085 = 2,112.90 : x
  2. Step 2: Convert to fraction form
    3,684.75/5,085 = 2,112.90/x
  3. Step 3: Cross multiply
    3,684.75x = 5,085 × 2,112.90
  4. Step 4: Simplify right side
    3,684.75x = 10,744,096.50
  5. Step 5: Solve for x
    x = 10,744,096.50/3,684.75
  6. Step 6: Final answer
    x = 2,915.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.