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Finding the Fourth Proportional to 519.84, 779.92 and 300.42

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Solution

The fourth proportional to 519.84, 779.92 and 300.42 is: 450.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.84 : 779.92 = 300.42 : x
  2. Step 2: Convert to fraction form
    519.84/779.92 = 300.42/x
  3. Step 3: Cross multiply
    519.84x = 779.92 × 300.42
  4. Step 4: Simplify right side
    519.84x = 234,301.02
  5. Step 5: Solve for x
    x = 234,301.02/519.84
  6. Step 6: Final answer
    x = 450.71

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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.