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Finding the Fourth Proportional to 511.20, 764.79 and 394.76

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Solution

The fourth proportional to 511.20, 764.79 and 394.76 is: 590.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.20 : 764.79 = 394.76 : x
  2. Step 2: Convert to fraction form
    511.20/764.79 = 394.76/x
  3. Step 3: Cross multiply
    511.20x = 764.79 × 394.76
  4. Step 4: Simplify right side
    511.20x = 301,908.50
  5. Step 5: Solve for x
    x = 301,908.50/511.20
  6. Step 6: Final answer
    x = 590.59

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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.