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Finding the Fourth Proportional to 511, 764.16 and 381.09

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Solution

The fourth proportional to 511, 764.16 and 381.09 is: 569.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    511 : 764.16 = 381.09 : x
  2. Step 2: Convert to fraction form
    511/764.16 = 381.09/x
  3. Step 3: Cross multiply
    511x = 764.16 × 381.09
  4. Step 4: Simplify right side
    511x = 291,213.73
  5. Step 5: Solve for x
    x = 291,213.73/511
  6. Step 6: Final answer
    x = 569.89

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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.