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Finding the Fourth Proportional to 2,679.91, 4,020.49 and 830.93

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Solution

The fourth proportional to 2,679.91, 4,020.49 and 830.93 is: 1,246.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.91 : 4,020.49 = 830.93 : x
  2. Step 2: Convert to fraction form
    2,679.91/4,020.49 = 830.93/x
  3. Step 3: Cross multiply
    2,679.91x = 4,020.49 × 830.93
  4. Step 4: Simplify right side
    2,679.91x = 3,340,745.76
  5. Step 5: Solve for x
    x = 3,340,745.76/2,679.91
  6. Step 6: Final answer
    x = 1,246.59

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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.