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Finding the Fourth Proportional to 320.20, 480.06 and 255.88

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Solution

The fourth proportional to 320.20, 480.06 and 255.88 is: 383.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.20 : 480.06 = 255.88 : x
  2. Step 2: Convert to fraction form
    320.20/480.06 = 255.88/x
  3. Step 3: Cross multiply
    320.20x = 480.06 × 255.88
  4. Step 4: Simplify right side
    320.20x = 122,837.75
  5. Step 5: Solve for x
    x = 122,837.75/320.20
  6. Step 6: Final answer
    x = 383.63

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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.