Home / 2,115.16-3,171.96-728.10

Finding the Fourth Proportional to 2,115.16, 3,171.96 and 728.10

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Solution

The fourth proportional to 2,115.16, 3,171.96 and 728.10 is: 1,091.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.16 : 3,171.96 = 728.10 : x
  2. Step 2: Convert to fraction form
    2,115.16/3,171.96 = 728.10/x
  3. Step 3: Cross multiply
    2,115.16x = 3,171.96 × 728.10
  4. Step 4: Simplify right side
    2,115.16x = 2,309,504.08
  5. Step 5: Solve for x
    x = 2,309,504.08/2,115.16
  6. Step 6: Final answer
    x = 1,091.88

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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.