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Finding the Fourth Proportional to 20,490.20, 30,694.80 and 18,054.80

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Solution

The fourth proportional to 20,490.20, 30,694.80 and 18,054.80 is: 27,046.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.20 : 30,694.80 = 18,054.80 : x
  2. Step 2: Convert to fraction form
    20,490.20/30,694.80 = 18,054.80/x
  3. Step 3: Cross multiply
    20,490.20x = 30,694.80 × 18,054.80
  4. Step 4: Simplify right side
    20,490.20x = 554,188,475.04
  5. Step 5: Solve for x
    x = 554,188,475.04/20,490.20
  6. Step 6: Final answer
    x = 27,046.51

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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.