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Finding the Fourth Proportional to 489.09, 674.33 and 395.49

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Solution

The fourth proportional to 489.09, 674.33 and 395.49 is: 545.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.09 : 674.33 = 395.49 : x
  2. Step 2: Convert to fraction form
    489.09/674.33 = 395.49/x
  3. Step 3: Cross multiply
    489.09x = 674.33 × 395.49
  4. Step 4: Simplify right side
    489.09x = 266,690.77
  5. Step 5: Solve for x
    x = 266,690.77/489.09
  6. Step 6: Final answer
    x = 545.28

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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.