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Finding the Fourth Proportional to 2,138.66, 3,207.70 and 677.96

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Solution

The fourth proportional to 2,138.66, 3,207.70 and 677.96 is: 1,016.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.66 : 3,207.70 = 677.96 : x
  2. Step 2: Convert to fraction form
    2,138.66/3,207.70 = 677.96/x
  3. Step 3: Cross multiply
    2,138.66x = 3,207.70 × 677.96
  4. Step 4: Simplify right side
    2,138.66x = 2,174,692.29
  5. Step 5: Solve for x
    x = 2,174,692.29/2,138.66
  6. Step 6: Final answer
    x = 1,016.85

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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.