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Finding the Fourth Proportional to 519.35, 779.50 and 211.42

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Solution

The fourth proportional to 519.35, 779.50 and 211.42 is: 317.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.35 : 779.50 = 211.42 : x
  2. Step 2: Convert to fraction form
    519.35/779.50 = 211.42/x
  3. Step 3: Cross multiply
    519.35x = 779.50 × 211.42
  4. Step 4: Simplify right side
    519.35x = 164,797.99
  5. Step 5: Solve for x
    x = 164,797.99/519.35
  6. Step 6: Final answer
    x = 317.32

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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.