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Finding the Fourth Proportional to 2,679.86, 4,020.30 and 949.70

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Solution

The fourth proportional to 2,679.86, 4,020.30 and 949.70 is: 1,424.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.86 : 4,020.30 = 949.70 : x
  2. Step 2: Convert to fraction form
    2,679.86/4,020.30 = 949.70/x
  3. Step 3: Cross multiply
    2,679.86x = 4,020.30 × 949.70
  4. Step 4: Simplify right side
    2,679.86x = 3,818,078.91
  5. Step 5: Solve for x
    x = 3,818,078.91/2,679.86
  6. Step 6: Final answer
    x = 1,424.73

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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.