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Finding the Fourth Proportional to 2,664.40, 3,997.26 and 815.44

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Solution

The fourth proportional to 2,664.40, 3,997.26 and 815.44 is: 1,223.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,664.40 : 3,997.26 = 815.44 : x
  2. Step 2: Convert to fraction form
    2,664.40/3,997.26 = 815.44/x
  3. Step 3: Cross multiply
    2,664.40x = 3,997.26 × 815.44
  4. Step 4: Simplify right side
    2,664.40x = 3,259,525.69
  5. Step 5: Solve for x
    x = 3,259,525.69/2,664.40
  6. Step 6: Final answer
    x = 1,223.36

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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.