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Finding the Fourth Proportional to 2,728.76, 4,090.98 and 1,085

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Solution

The fourth proportional to 2,728.76, 4,090.98 and 1,085 is: 1,626.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,728.76 : 4,090.98 = 1,085 : x
  2. Step 2: Convert to fraction form
    2,728.76/4,090.98 = 1,085/x
  3. Step 3: Cross multiply
    2,728.76x = 4,090.98 × 1,085
  4. Step 4: Simplify right side
    2,728.76x = 4,438,713.30
  5. Step 5: Solve for x
    x = 4,438,713.30/2,728.76
  6. Step 6: Final answer
    x = 1,626.64

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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.