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Finding the Fourth Proportional to 2,855.16, 3,936.78 and 2,647.80

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Solution

The fourth proportional to 2,855.16, 3,936.78 and 2,647.80 is: 3,650.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.16 : 3,936.78 = 2,647.80 : x
  2. Step 2: Convert to fraction form
    2,855.16/3,936.78 = 2,647.80/x
  3. Step 3: Cross multiply
    2,855.16x = 3,936.78 × 2,647.80
  4. Step 4: Simplify right side
    2,855.16x = 10,423,806.08
  5. Step 5: Solve for x
    x = 10,423,806.08/2,855.16
  6. Step 6: Final answer
    x = 3,650.87

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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.