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Finding the Fourth Proportional to 2,579.42, 3,869.34 and 824.66

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Solution

The fourth proportional to 2,579.42, 3,869.34 and 824.66 is: 1,237.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,579.42 : 3,869.34 = 824.66 : x
  2. Step 2: Convert to fraction form
    2,579.42/3,869.34 = 824.66/x
  3. Step 3: Cross multiply
    2,579.42x = 3,869.34 × 824.66
  4. Step 4: Simplify right side
    2,579.42x = 3,190,889.92
  5. Step 5: Solve for x
    x = 3,190,889.92/2,579.42
  6. Step 6: Final answer
    x = 1,237.06

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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.