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Finding the Fourth Proportional to 3,880.80, 5,353.20 and 2,760

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Solution

The fourth proportional to 3,880.80, 5,353.20 and 2,760 is: 3,807.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,880.80 : 5,353.20 = 2,760 : x
  2. Step 2: Convert to fraction form
    3,880.80/5,353.20 = 2,760/x
  3. Step 3: Cross multiply
    3,880.80x = 5,353.20 × 2,760
  4. Step 4: Simplify right side
    3,880.80x = 14,774,832
  5. Step 5: Solve for x
    x = 14,774,832/3,880.80
  6. Step 6: Final answer
    x = 3,807.16

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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.