Home / 20,880.72-28,815.84-12,704.22

Finding the Fourth Proportional to 20,880.72, 28,815.84 and 12,704.22

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Solution

The fourth proportional to 20,880.72, 28,815.84 and 12,704.22 is: 17,532.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.72 : 28,815.84 = 12,704.22 : x
  2. Step 2: Convert to fraction form
    20,880.72/28,815.84 = 12,704.22/x
  3. Step 3: Cross multiply
    20,880.72x = 28,815.84 × 12,704.22
  4. Step 4: Simplify right side
    20,880.72x = 366,082,770.84
  5. Step 5: Solve for x
    x = 366,082,770.84/20,880.72
  6. Step 6: Final answer
    x = 17,532.10

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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.