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Finding the Fourth Proportional to 2,759.88, 4,139.82 and 679.90

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Solution

The fourth proportional to 2,759.88, 4,139.82 and 679.90 is: 1,019.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.88 : 4,139.82 = 679.90 : x
  2. Step 2: Convert to fraction form
    2,759.88/4,139.82 = 679.90/x
  3. Step 3: Cross multiply
    2,759.88x = 4,139.82 × 679.90
  4. Step 4: Simplify right side
    2,759.88x = 2,814,663.62
  5. Step 5: Solve for x
    x = 2,814,663.62/2,759.88
  6. Step 6: Final answer
    x = 1,019.85

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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.