Home / 3,115.20-4,672.80-2,791.20

Finding the Fourth Proportional to 3,115.20, 4,672.80 and 2,791.20

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Solution

The fourth proportional to 3,115.20, 4,672.80 and 2,791.20 is: 4,186.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.20 : 4,672.80 = 2,791.20 : x
  2. Step 2: Convert to fraction form
    3,115.20/4,672.80 = 2,791.20/x
  3. Step 3: Cross multiply
    3,115.20x = 4,672.80 × 2,791.20
  4. Step 4: Simplify right side
    3,115.20x = 13,042,719.36
  5. Step 5: Solve for x
    x = 13,042,719.36/3,115.20
  6. Step 6: Final answer
    x = 4,186.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.