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Finding the Fourth Proportional to 2,051.28, 3,076.97 and 664.20

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Solution

The fourth proportional to 2,051.28, 3,076.97 and 664.20 is: 996.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,051.28 : 3,076.97 = 664.20 : x
  2. Step 2: Convert to fraction form
    2,051.28/3,076.97 = 664.20/x
  3. Step 3: Cross multiply
    2,051.28x = 3,076.97 × 664.20
  4. Step 4: Simplify right side
    2,051.28x = 2,043,720.15
  5. Step 5: Solve for x
    x = 2,043,720.15/2,051.28
  6. Step 6: Final answer
    x = 996.31

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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.