Home / 7,939.86-11,915.28-2,745.78

Finding the Fourth Proportional to 7,939.86, 11,915.28 and 2,745.78

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Solution

The fourth proportional to 7,939.86, 11,915.28 and 2,745.78 is: 4,120.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,939.86 : 11,915.28 = 2,745.78 : x
  2. Step 2: Convert to fraction form
    7,939.86/11,915.28 = 2,745.78/x
  3. Step 3: Cross multiply
    7,939.86x = 11,915.28 × 2,745.78
  4. Step 4: Simplify right side
    7,939.86x = 32,716,737.52
  5. Step 5: Solve for x
    x = 32,716,737.52/7,939.86
  6. Step 6: Final answer
    x = 4,120.57

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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.