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Finding the Fourth Proportional to 2,778.89, 3,837.96 and 2,156.94

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Solution

The fourth proportional to 2,778.89, 3,837.96 and 2,156.94 is: 2,978.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778.89 : 3,837.96 = 2,156.94 : x
  2. Step 2: Convert to fraction form
    2,778.89/3,837.96 = 2,156.94/x
  3. Step 3: Cross multiply
    2,778.89x = 3,837.96 × 2,156.94
  4. Step 4: Simplify right side
    2,778.89x = 8,278,249.44
  5. Step 5: Solve for x
    x = 8,278,249.44/2,778.89
  6. Step 6: Final answer
    x = 2,978.98

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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.