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Finding the Fourth Proportional to 20,280.76, 30,418.80 and 5,488.80

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Solution

The fourth proportional to 20,280.76, 30,418.80 and 5,488.80 is: 8,232.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.76 : 30,418.80 = 5,488.80 : x
  2. Step 2: Convert to fraction form
    20,280.76/30,418.80 = 5,488.80/x
  3. Step 3: Cross multiply
    20,280.76x = 30,418.80 × 5,488.80
  4. Step 4: Simplify right side
    20,280.76x = 166,962,709.44
  5. Step 5: Solve for x
    x = 166,962,709.44/20,280.76
  6. Step 6: Final answer
    x = 8,232.57

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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.