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Finding the Fourth Proportional to 511.31, 765.34 and 279.65

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Solution

The fourth proportional to 511.31, 765.34 and 279.65 is: 418.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.31 : 765.34 = 279.65 : x
  2. Step 2: Convert to fraction form
    511.31/765.34 = 279.65/x
  3. Step 3: Cross multiply
    511.31x = 765.34 × 279.65
  4. Step 4: Simplify right side
    511.31x = 214,028.55
  5. Step 5: Solve for x
    x = 214,028.55/511.31
  6. Step 6: Final answer
    x = 418.59

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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.