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Finding the Fourth Proportional to 20,662.14, 30,992.92 and 5,079.90

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Solution

The fourth proportional to 20,662.14, 30,992.92 and 5,079.90 is: 7,619.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,662.14 : 30,992.92 = 5,079.90 : x
  2. Step 2: Convert to fraction form
    20,662.14/30,992.92 = 5,079.90/x
  3. Step 3: Cross multiply
    20,662.14x = 30,992.92 × 5,079.90
  4. Step 4: Simplify right side
    20,662.14x = 157,440,934.31
  5. Step 5: Solve for x
    x = 157,440,934.31/20,662.14
  6. Step 6: Final answer
    x = 7,619.78

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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.