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Finding the Fourth Proportional to 519.92, 777.13 and 396.90

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Solution

The fourth proportional to 519.92, 777.13 and 396.90 is: 593.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.92 : 777.13 = 396.90 : x
  2. Step 2: Convert to fraction form
    519.92/777.13 = 396.90/x
  3. Step 3: Cross multiply
    519.92x = 777.13 × 396.90
  4. Step 4: Simplify right side
    519.92x = 308,439.01
  5. Step 5: Solve for x
    x = 308,439.01/519.92
  6. Step 6: Final answer
    x = 593.25

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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.