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Finding the Fourth Proportional to 518.94, 771.98 and 513.72

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Solution

The fourth proportional to 518.94, 771.98 and 513.72 is: 764.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.94 : 771.98 = 513.72 : x
  2. Step 2: Convert to fraction form
    518.94/771.98 = 513.72/x
  3. Step 3: Cross multiply
    518.94x = 771.98 × 513.72
  4. Step 4: Simplify right side
    518.94x = 396,579.00
  5. Step 5: Solve for x
    x = 396,579.00/518.94
  6. Step 6: Final answer
    x = 764.21

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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.