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Finding the Fourth Proportional to 6,889.80, 9,508.20 and 3,906

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Solution

The fourth proportional to 6,889.80, 9,508.20 and 3,906 is: 5,390.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,889.80 : 9,508.20 = 3,906 : x
  2. Step 2: Convert to fraction form
    6,889.80/9,508.20 = 3,906/x
  3. Step 3: Cross multiply
    6,889.80x = 9,508.20 × 3,906
  4. Step 4: Simplify right side
    6,889.80x = 37,139,029.20
  5. Step 5: Solve for x
    x = 37,139,029.20/6,889.80
  6. Step 6: Final answer
    x = 5,390.44

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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.