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Finding the Fourth Proportional to 18,793.20, 28,157.40 and 8,911.20

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Solution

The fourth proportional to 18,793.20, 28,157.40 and 8,911.20 is: 13,351.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,793.20 : 28,157.40 = 8,911.20 : x
  2. Step 2: Convert to fraction form
    18,793.20/28,157.40 = 8,911.20/x
  3. Step 3: Cross multiply
    18,793.20x = 28,157.40 × 8,911.20
  4. Step 4: Simplify right side
    18,793.20x = 250,916,222.88
  5. Step 5: Solve for x
    x = 250,916,222.88/18,793.20
  6. Step 6: Final answer
    x = 13,351.44

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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.