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Finding the Fourth Proportional to 2,515.88, 3,772.92 and 872

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Solution

The fourth proportional to 2,515.88, 3,772.92 and 872 is: 1,307.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,515.88 : 3,772.92 = 872 : x
  2. Step 2: Convert to fraction form
    2,515.88/3,772.92 = 872/x
  3. Step 3: Cross multiply
    2,515.88x = 3,772.92 × 872
  4. Step 4: Simplify right side
    2,515.88x = 3,289,986.24
  5. Step 5: Solve for x
    x = 3,289,986.24/2,515.88
  6. Step 6: Final answer
    x = 1,307.69

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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.