Home / 3,889.89-5,368.14-2,121.66

Finding the Fourth Proportional to 3,889.89, 5,368.14 and 2,121.66

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Solution

The fourth proportional to 3,889.89, 5,368.14 and 2,121.66 is: 2,927.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.89 : 5,368.14 = 2,121.66 : x
  2. Step 2: Convert to fraction form
    3,889.89/5,368.14 = 2,121.66/x
  3. Step 3: Cross multiply
    3,889.89x = 5,368.14 × 2,121.66
  4. Step 4: Simplify right side
    3,889.89x = 11,389,367.91
  5. Step 5: Solve for x
    x = 11,389,367.91/3,889.89
  6. Step 6: Final answer
    x = 2,927.94

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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.