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Finding the Fourth Proportional to 821.32, 1,233.21 and 515.11

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Solution

The fourth proportional to 821.32, 1,233.21 and 515.11 is: 773.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.32 : 1,233.21 = 515.11 : x
  2. Step 2: Convert to fraction form
    821.32/1,233.21 = 515.11/x
  3. Step 3: Cross multiply
    821.32x = 1,233.21 × 515.11
  4. Step 4: Simplify right side
    821.32x = 635,238.80
  5. Step 5: Solve for x
    x = 635,238.80/821.32
  6. Step 6: Final answer
    x = 773.44

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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.