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Finding the Fourth Proportional to 1,919.88, 2,879.52 and 687.26

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Solution

The fourth proportional to 1,919.88, 2,879.52 and 687.26 is: 1,030.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.88 : 2,879.52 = 687.26 : x
  2. Step 2: Convert to fraction form
    1,919.88/2,879.52 = 687.26/x
  3. Step 3: Cross multiply
    1,919.88x = 2,879.52 × 687.26
  4. Step 4: Simplify right side
    1,919.88x = 1,978,978.92
  5. Step 5: Solve for x
    x = 1,978,978.92/1,919.88
  6. Step 6: Final answer
    x = 1,030.78

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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.