Home / 3,889.80-5,367.89-2,121.39

Finding the Fourth Proportional to 3,889.80, 5,367.89 and 2,121.39

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Solution

The fourth proportional to 3,889.80, 5,367.89 and 2,121.39 is: 2,927.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.80 : 5,367.89 = 2,121.39 : x
  2. Step 2: Convert to fraction form
    3,889.80/5,367.89 = 2,121.39/x
  3. Step 3: Cross multiply
    3,889.80x = 5,367.89 × 2,121.39
  4. Step 4: Simplify right side
    3,889.80x = 11,387,393.47
  5. Step 5: Solve for x
    x = 11,387,393.47/3,889.80
  6. Step 6: Final answer
    x = 2,927.50

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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.