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Finding the Fourth Proportional to 489.92, 676.08 and 280.04

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Solution

The fourth proportional to 489.92, 676.08 and 280.04 is: 386.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.92 : 676.08 = 280.04 : x
  2. Step 2: Convert to fraction form
    489.92/676.08 = 280.04/x
  3. Step 3: Cross multiply
    489.92x = 676.08 × 280.04
  4. Step 4: Simplify right side
    489.92x = 189,329.44
  5. Step 5: Solve for x
    x = 189,329.44/489.92
  6. Step 6: Final answer
    x = 386.45

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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.