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Finding the Fourth Proportional to 2,138.64, 3,208.28 and 906.05

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Solution

The fourth proportional to 2,138.64, 3,208.28 and 906.05 is: 1,359.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.64 : 3,208.28 = 906.05 : x
  2. Step 2: Convert to fraction form
    2,138.64/3,208.28 = 906.05/x
  3. Step 3: Cross multiply
    2,138.64x = 3,208.28 × 906.05
  4. Step 4: Simplify right side
    2,138.64x = 2,906,857.56
  5. Step 5: Solve for x
    x = 2,906,857.56/2,138.64
  6. Step 6: Final answer
    x = 1,359.21

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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.