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Finding the Fourth Proportional to 519.79, 779.20 and 336.64

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Solution

The fourth proportional to 519.79, 779.20 and 336.64 is: 504.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.79 : 779.20 = 336.64 : x
  2. Step 2: Convert to fraction form
    519.79/779.20 = 336.64/x
  3. Step 3: Cross multiply
    519.79x = 779.20 × 336.64
  4. Step 4: Simplify right side
    519.79x = 262,309.89
  5. Step 5: Solve for x
    x = 262,309.89/519.79
  6. Step 6: Final answer
    x = 504.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.