Home / 2,171.20-3,255.36-872.96

Finding the Fourth Proportional to 2,171.20, 3,255.36 and 872.96

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Solution

The fourth proportional to 2,171.20, 3,255.36 and 872.96 is: 1,308.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.20 : 3,255.36 = 872.96 : x
  2. Step 2: Convert to fraction form
    2,171.20/3,255.36 = 872.96/x
  3. Step 3: Cross multiply
    2,171.20x = 3,255.36 × 872.96
  4. Step 4: Simplify right side
    2,171.20x = 2,841,799.07
  5. Step 5: Solve for x
    x = 2,841,799.07/2,171.20
  6. Step 6: Final answer
    x = 1,308.86

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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.