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Finding the Fourth Proportional to 3,889.92, 5,368.12 and 2,121.54

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Solution

The fourth proportional to 3,889.92, 5,368.12 and 2,121.54 is: 2,927.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.92 : 5,368.12 = 2,121.54 : x
  2. Step 2: Convert to fraction form
    3,889.92/5,368.12 = 2,121.54/x
  3. Step 3: Cross multiply
    3,889.92x = 5,368.12 × 2,121.54
  4. Step 4: Simplify right side
    3,889.92x = 11,388,698.00
  5. Step 5: Solve for x
    x = 11,388,698.00/3,889.92
  6. Step 6: Final answer
    x = 2,927.74

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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.