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Finding the Fourth Proportional to 821.75, 1,231.20 and 512.73

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Solution

The fourth proportional to 821.75, 1,231.20 and 512.73 is: 768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.75 : 1,231.20 = 512.73 : x
  2. Step 2: Convert to fraction form
    821.75/1,231.20 = 512.73/x
  3. Step 3: Cross multiply
    821.75x = 1,231.20 × 512.73
  4. Step 4: Simplify right side
    821.75x = 631,273.18
  5. Step 5: Solve for x
    x = 631,273.18/821.75
  6. Step 6: Final answer
    x = 768.21

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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.