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Finding the Fourth Proportional to 489.14, 674.98 and 279.35

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Solution

The fourth proportional to 489.14, 674.98 and 279.35 is: 385.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.14 : 674.98 = 279.35 : x
  2. Step 2: Convert to fraction form
    489.14/674.98 = 279.35/x
  3. Step 3: Cross multiply
    489.14x = 674.98 × 279.35
  4. Step 4: Simplify right side
    489.14x = 188,551.59
  5. Step 5: Solve for x
    x = 188,551.59/489.14
  6. Step 6: Final answer
    x = 385.48

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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.