Home / 3,915.70-5,403.68-2,147.28

Finding the Fourth Proportional to 3,915.70, 5,403.68 and 2,147.28

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Solution

The fourth proportional to 3,915.70, 5,403.68 and 2,147.28 is: 2,963.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.70 : 5,403.68 = 2,147.28 : x
  2. Step 2: Convert to fraction form
    3,915.70/5,403.68 = 2,147.28/x
  3. Step 3: Cross multiply
    3,915.70x = 5,403.68 × 2,147.28
  4. Step 4: Simplify right side
    3,915.70x = 11,603,213.99
  5. Step 5: Solve for x
    x = 11,603,213.99/3,915.70
  6. Step 6: Final answer
    x = 2,963.25

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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.