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Finding the Fourth Proportional to 3,889.92, 5,368.17 and 2,121.69

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Solution

The fourth proportional to 3,889.92, 5,368.17 and 2,121.69 is: 2,927.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.92 : 5,368.17 = 2,121.69 : x
  2. Step 2: Convert to fraction form
    3,889.92/5,368.17 = 2,121.69/x
  3. Step 3: Cross multiply
    3,889.92x = 5,368.17 × 2,121.69
  4. Step 4: Simplify right side
    3,889.92x = 11,389,620.69
  5. Step 5: Solve for x
    x = 11,389,620.69/3,889.92
  6. Step 6: Final answer
    x = 2,927.98

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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.