Home / 10,912.80-16,369.20-3,121.61

Finding the Fourth Proportional to 10,912.80, 16,369.20 and 3,121.61

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Solution

The fourth proportional to 10,912.80, 16,369.20 and 3,121.61 is: 4,682.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,912.80 : 16,369.20 = 3,121.61 : x
  2. Step 2: Convert to fraction form
    10,912.80/16,369.20 = 3,121.61/x
  3. Step 3: Cross multiply
    10,912.80x = 16,369.20 × 3,121.61
  4. Step 4: Simplify right side
    10,912.80x = 51,098,299.34
  5. Step 5: Solve for x
    x = 51,098,299.34/10,912.80
  6. Step 6: Final answer
    x = 4,682.42

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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.