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Finding the Fourth Proportional to 319.40, 480.18 and 255.22

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Solution

The fourth proportional to 319.40, 480.18 and 255.22 is: 383.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.40 : 480.18 = 255.22 : x
  2. Step 2: Convert to fraction form
    319.40/480.18 = 255.22/x
  3. Step 3: Cross multiply
    319.40x = 480.18 × 255.22
  4. Step 4: Simplify right side
    319.40x = 122,551.54
  5. Step 5: Solve for x
    x = 122,551.54/319.40
  6. Step 6: Final answer
    x = 383.69

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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.