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Finding the Fourth Proportional to 20,163.20, 30,244.80 and 18,219.20

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Solution

The fourth proportional to 20,163.20, 30,244.80 and 18,219.20 is: 27,328.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,163.20 : 30,244.80 = 18,219.20 : x
  2. Step 2: Convert to fraction form
    20,163.20/30,244.80 = 18,219.20/x
  3. Step 3: Cross multiply
    20,163.20x = 30,244.80 × 18,219.20
  4. Step 4: Simplify right side
    20,163.20x = 551,036,060.16
  5. Step 5: Solve for x
    x = 551,036,060.16/20,163.20
  6. Step 6: Final answer
    x = 27,328.80

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1.5x scale

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.