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Finding the Fourth Proportional to 2,138.67, 3,208.17 and 677.94

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Solution

The fourth proportional to 2,138.67, 3,208.17 and 677.94 is: 1,016.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.67 : 3,208.17 = 677.94 : x
  2. Step 2: Convert to fraction form
    2,138.67/3,208.17 = 677.94/x
  3. Step 3: Cross multiply
    2,138.67x = 3,208.17 × 677.94
  4. Step 4: Simplify right side
    2,138.67x = 2,174,946.77
  5. Step 5: Solve for x
    x = 2,174,946.77/2,138.67
  6. Step 6: Final answer
    x = 1,016.96

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1.5x scale

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.