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Finding the Fourth Proportional to 255.39, 351.54 and 218.49

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Solution

The fourth proportional to 255.39, 351.54 and 218.49 is: 300.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.39 : 351.54 = 218.49 : x
  2. Step 2: Convert to fraction form
    255.39/351.54 = 218.49/x
  3. Step 3: Cross multiply
    255.39x = 351.54 × 218.49
  4. Step 4: Simplify right side
    255.39x = 76,807.97
  5. Step 5: Solve for x
    x = 76,807.97/255.39
  6. Step 6: Final answer
    x = 300.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.