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Finding the Fourth Proportional to 480.38, 721.92 and 285.41

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Solution

The fourth proportional to 480.38, 721.92 and 285.41 is: 428.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.38 : 721.92 = 285.41 : x
  2. Step 2: Convert to fraction form
    480.38/721.92 = 285.41/x
  3. Step 3: Cross multiply
    480.38x = 721.92 × 285.41
  4. Step 4: Simplify right side
    480.38x = 206,043.92
  5. Step 5: Solve for x
    x = 206,043.92/480.38
  6. Step 6: Final answer
    x = 428.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.