Home / 2,115.33-3,172.38-728.61

Finding the Fourth Proportional to 2,115.33, 3,172.38 and 728.61

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Solution

The fourth proportional to 2,115.33, 3,172.38 and 728.61 is: 1,092.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.33 : 3,172.38 = 728.61 : x
  2. Step 2: Convert to fraction form
    2,115.33/3,172.38 = 728.61/x
  3. Step 3: Cross multiply
    2,115.33x = 3,172.38 × 728.61
  4. Step 4: Simplify right side
    2,115.33x = 2,311,427.79
  5. Step 5: Solve for x
    x = 2,311,427.79/2,115.33
  6. Step 6: Final answer
    x = 1,092.70

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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.