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Finding the Fourth Proportional to 3,915.99, 5,872.25 and 2,815.75

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Solution

The fourth proportional to 3,915.99, 5,872.25 and 2,815.75 is: 4,222.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.99 : 5,872.25 = 2,815.75 : x
  2. Step 2: Convert to fraction form
    3,915.99/5,872.25 = 2,815.75/x
  3. Step 3: Cross multiply
    3,915.99x = 5,872.25 × 2,815.75
  4. Step 4: Simplify right side
    3,915.99x = 16,534,773.86
  5. Step 5: Solve for x
    x = 16,534,773.86/3,915.99
  6. Step 6: Final answer
    x = 4,222.38

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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.