Home / 3,880.88-5,355.56-2,112.45

Finding the Fourth Proportional to 3,880.88, 5,355.56 and 2,112.45

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Solution

The fourth proportional to 3,880.88, 5,355.56 and 2,112.45 is: 2,915.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,880.88 : 5,355.56 = 2,112.45 : x
  2. Step 2: Convert to fraction form
    3,880.88/5,355.56 = 2,112.45/x
  3. Step 3: Cross multiply
    3,880.88x = 5,355.56 × 2,112.45
  4. Step 4: Simplify right side
    3,880.88x = 11,313,342.16
  5. Step 5: Solve for x
    x = 11,313,342.16/3,880.88
  6. Step 6: Final answer
    x = 2,915.15

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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.