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Finding the Fourth Proportional to 8,920.99, 13,380.96 and 2,680.86

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Solution

The fourth proportional to 8,920.99, 13,380.96 and 2,680.86 is: 4,021.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.99 : 13,380.96 = 2,680.86 : x
  2. Step 2: Convert to fraction form
    8,920.99/13,380.96 = 2,680.86/x
  3. Step 3: Cross multiply
    8,920.99x = 13,380.96 × 2,680.86
  4. Step 4: Simplify right side
    8,920.99x = 35,872,517.23
  5. Step 5: Solve for x
    x = 35,872,517.23/8,920.99
  6. Step 6: Final answer
    x = 4,021.14

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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.