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Finding the Fourth Proportional to 843.20, 1,163.63 and 489.15

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Solution

The fourth proportional to 843.20, 1,163.63 and 489.15 is: 675.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.20 : 1,163.63 = 489.15 : x
  2. Step 2: Convert to fraction form
    843.20/1,163.63 = 489.15/x
  3. Step 3: Cross multiply
    843.20x = 1,163.63 × 489.15
  4. Step 4: Simplify right side
    843.20x = 569,189.61
  5. Step 5: Solve for x
    x = 569,189.61/843.20
  6. Step 6: Final answer
    x = 675.04

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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.