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Finding the Fourth Proportional to 2,664.99, 3,997.31 and 815.93

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Solution

The fourth proportional to 2,664.99, 3,997.31 and 815.93 is: 1,223.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,664.99 : 3,997.31 = 815.93 : x
  2. Step 2: Convert to fraction form
    2,664.99/3,997.31 = 815.93/x
  3. Step 3: Cross multiply
    2,664.99x = 3,997.31 × 815.93
  4. Step 4: Simplify right side
    2,664.99x = 3,261,505.16
  5. Step 5: Solve for x
    x = 3,261,505.16/2,664.99
  6. Step 6: Final answer
    x = 1,223.84

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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.