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Finding the Fourth Proportional to 320, 479.28 and 255.68

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Solution

The fourth proportional to 320, 479.28 and 255.68 is: 382.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    320 : 479.28 = 255.68 : x
  2. Step 2: Convert to fraction form
    320/479.28 = 255.68/x
  3. Step 3: Cross multiply
    320x = 479.28 × 255.68
  4. Step 4: Simplify right side
    320x = 122,542.31
  5. Step 5: Solve for x
    x = 122,542.31/320
  6. Step 6: Final answer
    x = 382.94

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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.