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Finding the Fourth Proportional to 2,579.43, 3,868.78 and 824.64

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Solution

The fourth proportional to 2,579.43, 3,868.78 and 824.64 is: 1,236.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,579.43 : 3,868.78 = 824.64 : x
  2. Step 2: Convert to fraction form
    2,579.43/3,868.78 = 824.64/x
  3. Step 3: Cross multiply
    2,579.43x = 3,868.78 × 824.64
  4. Step 4: Simplify right side
    2,579.43x = 3,190,350.74
  5. Step 5: Solve for x
    x = 3,190,350.74/2,579.43
  6. Step 6: Final answer
    x = 1,236.84

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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.