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Finding the Fourth Proportional to 28,142.20, 38,836.02 and 16,816.60

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Solution

The fourth proportional to 28,142.20, 38,836.02 and 16,816.60 is: 23,206.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,142.20 : 38,836.02 = 16,816.60 : x
  2. Step 2: Convert to fraction form
    28,142.20/38,836.02 = 16,816.60/x
  3. Step 3: Cross multiply
    28,142.20x = 38,836.02 × 16,816.60
  4. Step 4: Simplify right side
    28,142.20x = 653,089,813.93
  5. Step 5: Solve for x
    x = 653,089,813.93/28,142.20
  6. Step 6: Final answer
    x = 23,206.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.