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Finding the Fourth Proportional to 821.08, 1,132.81 and 489.57

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Solution

The fourth proportional to 821.08, 1,132.81 and 489.57 is: 675.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.08 : 1,132.81 = 489.57 : x
  2. Step 2: Convert to fraction form
    821.08/1,132.81 = 489.57/x
  3. Step 3: Cross multiply
    821.08x = 1,132.81 × 489.57
  4. Step 4: Simplify right side
    821.08x = 554,589.79
  5. Step 5: Solve for x
    x = 554,589.79/821.08
  6. Step 6: Final answer
    x = 675.44

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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.