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Finding the Fourth Proportional to 2,664.54, 3,996.97 and 815.78

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Solution

The fourth proportional to 2,664.54, 3,996.97 and 815.78 is: 1,223.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,664.54 : 3,996.97 = 815.78 : x
  2. Step 2: Convert to fraction form
    2,664.54/3,996.97 = 815.78/x
  3. Step 3: Cross multiply
    2,664.54x = 3,996.97 × 815.78
  4. Step 4: Simplify right side
    2,664.54x = 3,260,656.14
  5. Step 5: Solve for x
    x = 3,260,656.14/2,664.54
  6. Step 6: Final answer
    x = 1,223.72

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1.5x scale

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.