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Finding the Fourth Proportional to 13,821.20, 20,731.80 and 8,280.80

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Solution

The fourth proportional to 13,821.20, 20,731.80 and 8,280.80 is: 12,421.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,821.20 : 20,731.80 = 8,280.80 : x
  2. Step 2: Convert to fraction form
    13,821.20/20,731.80 = 8,280.80/x
  3. Step 3: Cross multiply
    13,821.20x = 20,731.80 × 8,280.80
  4. Step 4: Simplify right side
    13,821.20x = 171,675,889.44
  5. Step 5: Solve for x
    x = 171,675,889.44/13,821.20
  6. Step 6: Final answer
    x = 12,421.20

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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.