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Finding the Fourth Proportional to 821.21, 1,132.97 and 673.79

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Solution

The fourth proportional to 821.21, 1,132.97 and 673.79 is: 929.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.21 : 1,132.97 = 673.79 : x
  2. Step 2: Convert to fraction form
    821.21/1,132.97 = 673.79/x
  3. Step 3: Cross multiply
    821.21x = 1,132.97 × 673.79
  4. Step 4: Simplify right side
    821.21x = 763,374.82
  5. Step 5: Solve for x
    x = 763,374.82/821.21
  6. Step 6: Final answer
    x = 929.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.