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Finding the Fourth Proportional to 821.73, 1,233.21 and 661.35

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Solution

The fourth proportional to 821.73, 1,233.21 and 661.35 is: 992.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.73 : 1,233.21 = 661.35 : x
  2. Step 2: Convert to fraction form
    821.73/1,233.21 = 661.35/x
  3. Step 3: Cross multiply
    821.73x = 1,233.21 × 661.35
  4. Step 4: Simplify right side
    821.73x = 815,583.43
  5. Step 5: Solve for x
    x = 815,583.43/821.73
  6. Step 6: Final answer
    x = 992.52

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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.