Home / 3,880.81-5,355.51-2,112.43

Finding the Fourth Proportional to 3,880.81, 5,355.51 and 2,112.43

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Solution

The fourth proportional to 3,880.81, 5,355.51 and 2,112.43 is: 2,915.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,880.81 : 5,355.51 = 2,112.43 : x
  2. Step 2: Convert to fraction form
    3,880.81/5,355.51 = 2,112.43/x
  3. Step 3: Cross multiply
    3,880.81x = 5,355.51 × 2,112.43
  4. Step 4: Simplify right side
    3,880.81x = 11,313,113.21
  5. Step 5: Solve for x
    x = 11,313,113.21/3,880.81
  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.