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Finding the Fourth Proportional to 559.54, 772.11 and 310.85

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Solution

The fourth proportional to 559.54, 772.11 and 310.85 is: 428.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.54 : 772.11 = 310.85 : x
  2. Step 2: Convert to fraction form
    559.54/772.11 = 310.85/x
  3. Step 3: Cross multiply
    559.54x = 772.11 × 310.85
  4. Step 4: Simplify right side
    559.54x = 240,010.39
  5. Step 5: Solve for x
    x = 240,010.39/559.54
  6. Step 6: Final answer
    x = 428.95

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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.