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Finding the Fourth Proportional to 579.20, 800.46 and 439.28

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Solution

The fourth proportional to 579.20, 800.46 and 439.28 is: 607.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.20 : 800.46 = 439.28 : x
  2. Step 2: Convert to fraction form
    579.20/800.46 = 439.28/x
  3. Step 3: Cross multiply
    579.20x = 800.46 × 439.28
  4. Step 4: Simplify right side
    579.20x = 351,626.07
  5. Step 5: Solve for x
    x = 351,626.07/579.20
  6. Step 6: Final answer
    x = 607.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.