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Finding the Fourth Proportional to 20,105.40, 30,125.70 and 16,800.60

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Solution

The fourth proportional to 20,105.40, 30,125.70 and 16,800.60 is: 25,173.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,105.40 : 30,125.70 = 16,800.60 : x
  2. Step 2: Convert to fraction form
    20,105.40/30,125.70 = 16,800.60/x
  3. Step 3: Cross multiply
    20,105.40x = 30,125.70 × 16,800.60
  4. Step 4: Simplify right side
    20,105.40x = 506,129,835.42
  5. Step 5: Solve for x
    x = 506,129,835.42/20,105.40
  6. Step 6: Final answer
    x = 25,173.83

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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.