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Finding the Fourth Proportional to 20,109.20, 30,163.80 and 16,998.80

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Solution

The fourth proportional to 20,109.20, 30,163.80 and 16,998.80 is: 25,498.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.20 : 30,163.80 = 16,998.80 : x
  2. Step 2: Convert to fraction form
    20,109.20/30,163.80 = 16,998.80/x
  3. Step 3: Cross multiply
    20,109.20x = 30,163.80 × 16,998.80
  4. Step 4: Simplify right side
    20,109.20x = 512,748,403.44
  5. Step 5: Solve for x
    x = 512,748,403.44/20,109.20
  6. Step 6: Final answer
    x = 25,498.20

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Double scale
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Similar ratio
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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.