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Finding the Fourth Proportional to 2,138.67, 3,207.87 and 905.85

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Solution

The fourth proportional to 2,138.67, 3,207.87 and 905.85 is: 1,358.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.67 : 3,207.87 = 905.85 : x
  2. Step 2: Convert to fraction form
    2,138.67/3,207.87 = 905.85/x
  3. Step 3: Cross multiply
    2,138.67x = 3,207.87 × 905.85
  4. Step 4: Simplify right side
    2,138.67x = 2,905,849.04
  5. Step 5: Solve for x
    x = 2,905,849.04/2,138.67
  6. Step 6: Final answer
    x = 1,358.72

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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.