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Finding the Fourth Proportional to 579.20, 798.89 and 392.60

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Solution

The fourth proportional to 579.20, 798.89 and 392.60 is: 541.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.20 : 798.89 = 392.60 : x
  2. Step 2: Convert to fraction form
    579.20/798.89 = 392.60/x
  3. Step 3: Cross multiply
    579.20x = 798.89 × 392.60
  4. Step 4: Simplify right side
    579.20x = 313,644.25
  5. Step 5: Solve for x
    x = 313,644.25/579.20
  6. Step 6: Final answer
    x = 541.52

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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.