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Finding the Fourth Proportional to 319.88, 480.13 and 281.61

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Solution

The fourth proportional to 319.88, 480.13 and 281.61 is: 422.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.88 : 480.13 = 281.61 : x
  2. Step 2: Convert to fraction form
    319.88/480.13 = 281.61/x
  3. Step 3: Cross multiply
    319.88x = 480.13 × 281.61
  4. Step 4: Simplify right side
    319.88x = 135,208.71
  5. Step 5: Solve for x
    x = 135,208.71/319.88
  6. Step 6: Final answer
    x = 422.68

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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.