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Finding the Fourth Proportional to 821, 1,231.58 and 327.29

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Solution

The fourth proportional to 821, 1,231.58 and 327.29 is: 490.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    821 : 1,231.58 = 327.29 : x
  2. Step 2: Convert to fraction form
    821/1,231.58 = 327.29/x
  3. Step 3: Cross multiply
    821x = 1,231.58 × 327.29
  4. Step 4: Simplify right side
    821x = 403,083.82
  5. Step 5: Solve for x
    x = 403,083.82/821
  6. Step 6: Final answer
    x = 490.97

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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.