Home / 3,891.89-5,370.94-2,123.60

Finding the Fourth Proportional to 3,891.89, 5,370.94 and 2,123.60

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Solution

The fourth proportional to 3,891.89, 5,370.94 and 2,123.60 is: 2,930.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.89 : 5,370.94 = 2,123.60 : x
  2. Step 2: Convert to fraction form
    3,891.89/5,370.94 = 2,123.60/x
  3. Step 3: Cross multiply
    3,891.89x = 5,370.94 × 2,123.60
  4. Step 4: Simplify right side
    3,891.89x = 11,405,703.98
  5. Step 5: Solve for x
    x = 11,405,703.98/3,891.89
  6. Step 6: Final answer
    x = 2,930.63

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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.