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Finding the Fourth Proportional to 15,168.21, 20,928.60 and 9,198.69

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Solution

The fourth proportional to 15,168.21, 20,928.60 and 9,198.69 is: 12,692.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,168.21 : 20,928.60 = 9,198.69 : x
  2. Step 2: Convert to fraction form
    15,168.21/20,928.60 = 9,198.69/x
  3. Step 3: Cross multiply
    15,168.21x = 20,928.60 × 9,198.69
  4. Step 4: Simplify right side
    15,168.21x = 192,515,703.53
  5. Step 5: Solve for x
    x = 192,515,703.53/15,168.21
  6. Step 6: Final answer
    x = 12,692.05

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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.