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Finding the Fourth Proportional to 579.78, 868.20 and 449.56

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Solution

The fourth proportional to 579.78, 868.20 and 449.56 is: 673.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.78 : 868.20 = 449.56 : x
  2. Step 2: Convert to fraction form
    579.78/868.20 = 449.56/x
  3. Step 3: Cross multiply
    579.78x = 868.20 × 449.56
  4. Step 4: Simplify right side
    579.78x = 390,307.99
  5. Step 5: Solve for x
    x = 390,307.99/579.78
  6. Step 6: Final answer
    x = 673.20

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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.