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Finding the Fourth Proportional to 20,704.80, 31,049.10 and 7,550.40

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Solution

The fourth proportional to 20,704.80, 31,049.10 and 7,550.40 is: 11,322.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,704.80 : 31,049.10 = 7,550.40 : x
  2. Step 2: Convert to fraction form
    20,704.80/31,049.10 = 7,550.40/x
  3. Step 3: Cross multiply
    20,704.80x = 31,049.10 × 7,550.40
  4. Step 4: Simplify right side
    20,704.80x = 234,433,124.64
  5. Step 5: Solve for x
    x = 234,433,124.64/20,704.80
  6. Step 6: Final answer
    x = 11,322.65

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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.