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Finding the Fourth Proportional to 20,751.88, 28,621.72 and 13,199.44

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Solution

The fourth proportional to 20,751.88, 28,621.72 and 13,199.44 is: 18,205.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.88 : 28,621.72 = 13,199.44 : x
  2. Step 2: Convert to fraction form
    20,751.88/28,621.72 = 13,199.44/x
  3. Step 3: Cross multiply
    20,751.88x = 28,621.72 × 13,199.44
  4. Step 4: Simplify right side
    20,751.88x = 377,790,675.84
  5. Step 5: Solve for x
    x = 377,790,675.84/20,751.88
  6. Step 6: Final answer
    x = 18,205.13

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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.