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Finding the Fourth Proportional to 2,814.88, 3,879.12 and 1,985.44

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Solution

The fourth proportional to 2,814.88, 3,879.12 and 1,985.44 is: 2,736.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,814.88 : 3,879.12 = 1,985.44 : x
  2. Step 2: Convert to fraction form
    2,814.88/3,879.12 = 1,985.44/x
  3. Step 3: Cross multiply
    2,814.88x = 3,879.12 × 1,985.44
  4. Step 4: Simplify right side
    2,814.88x = 7,701,760.01
  5. Step 5: Solve for x
    x = 7,701,760.01/2,814.88
  6. Step 6: Final answer
    x = 2,736.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.