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Finding the Fourth Proportional to 3,892.89, 5,372.19 and 2,775.78

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Solution

The fourth proportional to 3,892.89, 5,372.19 and 2,775.78 is: 3,830.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,892.89 : 5,372.19 = 2,775.78 : x
  2. Step 2: Convert to fraction form
    3,892.89/5,372.19 = 2,775.78/x
  3. Step 3: Cross multiply
    3,892.89x = 5,372.19 × 2,775.78
  4. Step 4: Simplify right side
    3,892.89x = 14,911,990.70
  5. Step 5: Solve for x
    x = 14,911,990.70/3,892.89
  6. Step 6: Final answer
    x = 3,830.57

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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.