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Finding the Fourth Proportional to 2,855.35, 3,938.11 and 2,114.20

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Solution

The fourth proportional to 2,855.35, 3,938.11 and 2,114.20 is: 2,915.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.35 : 3,938.11 = 2,114.20 : x
  2. Step 2: Convert to fraction form
    2,855.35/3,938.11 = 2,114.20/x
  3. Step 3: Cross multiply
    2,855.35x = 3,938.11 × 2,114.20
  4. Step 4: Simplify right side
    2,855.35x = 8,325,952.16
  5. Step 5: Solve for x
    x = 8,325,952.16/2,855.35
  6. Step 6: Final answer
    x = 2,915.91

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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.