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Finding the Fourth Proportional to 521.91, 778.74 and 518.85

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Solution

The fourth proportional to 521.91, 778.74 and 518.85 is: 774.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.91 : 778.74 = 518.85 : x
  2. Step 2: Convert to fraction form
    521.91/778.74 = 518.85/x
  3. Step 3: Cross multiply
    521.91x = 778.74 × 518.85
  4. Step 4: Simplify right side
    521.91x = 404,049.25
  5. Step 5: Solve for x
    x = 404,049.25/521.91
  6. Step 6: Final answer
    x = 774.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.