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Finding the Fourth Proportional to 821.33, 1,133.85 and 634.40

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Solution

The fourth proportional to 821.33, 1,133.85 and 634.40 is: 875.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.33 : 1,133.85 = 634.40 : x
  2. Step 2: Convert to fraction form
    821.33/1,133.85 = 634.40/x
  3. Step 3: Cross multiply
    821.33x = 1,133.85 × 634.40
  4. Step 4: Simplify right side
    821.33x = 719,314.44
  5. Step 5: Solve for x
    x = 719,314.44/821.33
  6. Step 6: Final answer
    x = 875.79

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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.