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Finding the Fourth Proportional to 2,585.99, 3,879 and 1,105.00

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Solution

The fourth proportional to 2,585.99, 3,879 and 1,105.00 is: 1,657.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,585.99 : 3,879 = 1,105.00 : x
  2. Step 2: Convert to fraction form
    2,585.99/3,879 = 1,105.00/x
  3. Step 3: Cross multiply
    2,585.99x = 3,879 × 1,105.00
  4. Step 4: Simplify right side
    2,585.99x = 4,286,285.30
  5. Step 5: Solve for x
    x = 4,286,285.30/2,585.99
  6. Step 6: Final answer
    x = 1,657.50

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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.