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Finding the Fourth Proportional to 255.20, 352.18 and 138.76

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Solution

The fourth proportional to 255.20, 352.18 and 138.76 is: 191.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.20 : 352.18 = 138.76 : x
  2. Step 2: Convert to fraction form
    255.20/352.18 = 138.76/x
  3. Step 3: Cross multiply
    255.20x = 352.18 × 138.76
  4. Step 4: Simplify right side
    255.20x = 48,868.99
  5. Step 5: Solve for x
    x = 48,868.99/255.20
  6. Step 6: Final answer
    x = 191.49

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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.