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Finding the Fourth Proportional to 2,138.61, 3,208.01 and 677.73

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Solution

The fourth proportional to 2,138.61, 3,208.01 and 677.73 is: 1,016.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.61 : 3,208.01 = 677.73 : x
  2. Step 2: Convert to fraction form
    2,138.61/3,208.01 = 677.73/x
  3. Step 3: Cross multiply
    2,138.61x = 3,208.01 × 677.73
  4. Step 4: Simplify right side
    2,138.61x = 2,174,161.23
  5. Step 5: Solve for x
    x = 2,174,161.23/2,138.61
  6. Step 6: Final answer
    x = 1,016.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.