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Finding the Fourth Proportional to 489, 674.73 and 279.19

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Solution

The fourth proportional to 489, 674.73 and 279.19 is: 385.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 674.73 = 279.19 : x
  2. Step 2: Convert to fraction form
    489/674.73 = 279.19/x
  3. Step 3: Cross multiply
    489x = 674.73 × 279.19
  4. Step 4: Simplify right side
    489x = 188,377.87
  5. Step 5: Solve for x
    x = 188,377.87/489
  6. Step 6: Final answer
    x = 385.23

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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.