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Finding the Fourth Proportional to 821.22, 1,133.17 and 489.57

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Solution

The fourth proportional to 821.22, 1,133.17 and 489.57 is: 675.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.22 : 1,133.17 = 489.57 : x
  2. Step 2: Convert to fraction form
    821.22/1,133.17 = 489.57/x
  3. Step 3: Cross multiply
    821.22x = 1,133.17 × 489.57
  4. Step 4: Simplify right side
    821.22x = 554,766.04
  5. Step 5: Solve for x
    x = 554,766.04/821.22
  6. Step 6: Final answer
    x = 675.54

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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.