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Finding the Fourth Proportional to 843.31, 1,163.51 and 489.16

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Solution

The fourth proportional to 843.31, 1,163.51 and 489.16 is: 674.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.31 : 1,163.51 = 489.16 : x
  2. Step 2: Convert to fraction form
    843.31/1,163.51 = 489.16/x
  3. Step 3: Cross multiply
    843.31x = 1,163.51 × 489.16
  4. Step 4: Simplify right side
    843.31x = 569,141.33
  5. Step 5: Solve for x
    x = 569,141.33/843.31
  6. Step 6: Final answer
    x = 674.89

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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.