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Finding the Fourth Proportional to 2,115.81, 3,170.22 and 728.40

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Solution

The fourth proportional to 2,115.81, 3,170.22 and 728.40 is: 1,091.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.81 : 3,170.22 = 728.40 : x
  2. Step 2: Convert to fraction form
    2,115.81/3,170.22 = 728.40/x
  3. Step 3: Cross multiply
    2,115.81x = 3,170.22 × 728.40
  4. Step 4: Simplify right side
    2,115.81x = 2,309,188.25
  5. Step 5: Solve for x
    x = 2,309,188.25/2,115.81
  6. Step 6: Final answer
    x = 1,091.40

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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.