Home / 3,915.75-5,403.78-2,147.22

Finding the Fourth Proportional to 3,915.75, 5,403.78 and 2,147.22

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Solution

The fourth proportional to 3,915.75, 5,403.78 and 2,147.22 is: 2,963.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.75 : 5,403.78 = 2,147.22 : x
  2. Step 2: Convert to fraction form
    3,915.75/5,403.78 = 2,147.22/x
  3. Step 3: Cross multiply
    3,915.75x = 5,403.78 × 2,147.22
  4. Step 4: Simplify right side
    3,915.75x = 11,603,104.49
  5. Step 5: Solve for x
    x = 11,603,104.49/3,915.75
  6. Step 6: Final answer
    x = 2,963.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.