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Finding the Fourth Proportional to 489.03, 674.73 and 395.70

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Solution

The fourth proportional to 489.03, 674.73 and 395.70 is: 545.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.03 : 674.73 = 395.70 : x
  2. Step 2: Convert to fraction form
    489.03/674.73 = 395.70/x
  3. Step 3: Cross multiply
    489.03x = 674.73 × 395.70
  4. Step 4: Simplify right side
    489.03x = 266,990.66
  5. Step 5: Solve for x
    x = 266,990.66/489.03
  6. Step 6: Final answer
    x = 545.96

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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.