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Finding the Fourth Proportional to 255.28, 383.42 and 218.70

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Solution

The fourth proportional to 255.28, 383.42 and 218.70 is: 328.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.28 : 383.42 = 218.70 : x
  2. Step 2: Convert to fraction form
    255.28/383.42 = 218.70/x
  3. Step 3: Cross multiply
    255.28x = 383.42 × 218.70
  4. Step 4: Simplify right side
    255.28x = 83,854.09
  5. Step 5: Solve for x
    x = 83,854.09/255.28
  6. Step 6: Final answer
    x = 328.48

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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.