Home / 3,889.76-5,367.78-2,121.35

Finding the Fourth Proportional to 3,889.76, 5,367.78 and 2,121.35

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Solution

The fourth proportional to 3,889.76, 5,367.78 and 2,121.35 is: 2,927.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.76 : 5,367.78 = 2,121.35 : x
  2. Step 2: Convert to fraction form
    3,889.76/5,367.78 = 2,121.35/x
  3. Step 3: Cross multiply
    3,889.76x = 5,367.78 × 2,121.35
  4. Step 4: Simplify right side
    3,889.76x = 11,386,913.26
  5. Step 5: Solve for x
    x = 11,386,913.26/3,889.76
  6. Step 6: Final answer
    x = 2,927.41

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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.