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Finding the Fourth Proportional to 559.20, 771.79 and 310.60

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Solution

The fourth proportional to 559.20, 771.79 and 310.60 is: 428.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.20 : 771.79 = 310.60 : x
  2. Step 2: Convert to fraction form
    559.20/771.79 = 310.60/x
  3. Step 3: Cross multiply
    559.20x = 771.79 × 310.60
  4. Step 4: Simplify right side
    559.20x = 239,717.97
  5. Step 5: Solve for x
    x = 239,717.97/559.20
  6. Step 6: Final answer
    x = 428.68

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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.