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Finding the Fourth Proportional to 821.45, 1,231.83 and 301.33

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Solution

The fourth proportional to 821.45, 1,231.83 and 301.33 is: 451.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.45 : 1,231.83 = 301.33 : x
  2. Step 2: Convert to fraction form
    821.45/1,231.83 = 301.33/x
  3. Step 3: Cross multiply
    821.45x = 1,231.83 × 301.33
  4. Step 4: Simplify right side
    821.45x = 371,181.17
  5. Step 5: Solve for x
    x = 371,181.17/821.45
  6. Step 6: Final answer
    x = 451.86

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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.