Home / 20,391.21-30,578.49-7,908.84

Finding the Fourth Proportional to 20,391.21, 30,578.49 and 7,908.84

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Solution

The fourth proportional to 20,391.21, 30,578.49 and 7,908.84 is: 11,860.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.21 : 30,578.49 = 7,908.84 : x
  2. Step 2: Convert to fraction form
    20,391.21/30,578.49 = 7,908.84/x
  3. Step 3: Cross multiply
    20,391.21x = 30,578.49 × 7,908.84
  4. Step 4: Simplify right side
    20,391.21x = 241,840,384.85
  5. Step 5: Solve for x
    x = 241,840,384.85/20,391.21
  6. Step 6: Final answer
    x = 11,860.03

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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.