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Finding the Fourth Proportional to 521.64, 778.38 and 518.60

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Solution

The fourth proportional to 521.64, 778.38 and 518.60 is: 773.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.64 : 778.38 = 518.60 : x
  2. Step 2: Convert to fraction form
    521.64/778.38 = 518.60/x
  3. Step 3: Cross multiply
    521.64x = 778.38 × 518.60
  4. Step 4: Simplify right side
    521.64x = 403,667.87
  5. Step 5: Solve for x
    x = 403,667.87/521.64
  6. Step 6: Final answer
    x = 773.84

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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.