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Finding the Fourth Proportional to 3,551.80, 4,900 and 2,115.88

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Solution

The fourth proportional to 3,551.80, 4,900 and 2,115.88 is: 2,919.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,551.80 : 4,900 = 2,115.88 : x
  2. Step 2: Convert to fraction form
    3,551.80/4,900 = 2,115.88/x
  3. Step 3: Cross multiply
    3,551.80x = 4,900 × 2,115.88
  4. Step 4: Simplify right side
    3,551.80x = 10,367,812
  5. Step 5: Solve for x
    x = 10,367,812/3,551.80
  6. Step 6: Final answer
    x = 2,919.03

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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.