Home / 3,868.80-5,339.20-2,190.20

Finding the Fourth Proportional to 3,868.80, 5,339.20 and 2,190.20

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Solution

The fourth proportional to 3,868.80, 5,339.20 and 2,190.20 is: 3,022.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,868.80 : 5,339.20 = 2,190.20 : x
  2. Step 2: Convert to fraction form
    3,868.80/5,339.20 = 2,190.20/x
  3. Step 3: Cross multiply
    3,868.80x = 5,339.20 × 2,190.20
  4. Step 4: Simplify right side
    3,868.80x = 11,693,915.84
  5. Step 5: Solve for x
    x = 11,693,915.84/3,868.80
  6. Step 6: Final answer
    x = 3,022.62

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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.