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Finding the Fourth Proportional to 518.64, 773.22 and 487.65

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Solution

The fourth proportional to 518.64, 773.22 and 487.65 is: 727.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.64 : 773.22 = 487.65 : x
  2. Step 2: Convert to fraction form
    518.64/773.22 = 487.65/x
  3. Step 3: Cross multiply
    518.64x = 773.22 × 487.65
  4. Step 4: Simplify right side
    518.64x = 377,060.73
  5. Step 5: Solve for x
    x = 377,060.73/518.64
  6. Step 6: Final answer
    x = 727.02

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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.