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Finding the Fourth Proportional to 489.69, 676.49 and 484.43

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Solution

The fourth proportional to 489.69, 676.49 and 484.43 is: 669.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.69 : 676.49 = 484.43 : x
  2. Step 2: Convert to fraction form
    489.69/676.49 = 484.43/x
  3. Step 3: Cross multiply
    489.69x = 676.49 × 484.43
  4. Step 4: Simplify right side
    489.69x = 327,706.25
  5. Step 5: Solve for x
    x = 327,706.25/489.69
  6. Step 6: Final answer
    x = 669.21

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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.