Home / 3,889.12-5,366.88-2,120.64

Finding the Fourth Proportional to 3,889.12, 5,366.88 and 2,120.64

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Solution

The fourth proportional to 3,889.12, 5,366.88 and 2,120.64 is: 2,926.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.12 : 5,366.88 = 2,120.64 : x
  2. Step 2: Convert to fraction form
    3,889.12/5,366.88 = 2,120.64/x
  3. Step 3: Cross multiply
    3,889.12x = 5,366.88 × 2,120.64
  4. Step 4: Simplify right side
    3,889.12x = 11,381,220.40
  5. Step 5: Solve for x
    x = 11,381,220.40/3,889.12
  6. Step 6: Final answer
    x = 2,926.43

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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.