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Finding the Fourth Proportional to 255.42, 352.49 and 138.99

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Solution

The fourth proportional to 255.42, 352.49 and 138.99 is: 191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.42 : 352.49 = 138.99 : x
  2. Step 2: Convert to fraction form
    255.42/352.49 = 138.99/x
  3. Step 3: Cross multiply
    255.42x = 352.49 × 138.99
  4. Step 4: Simplify right side
    255.42x = 48,991.89
  5. Step 5: Solve for x
    x = 48,991.89/255.42
  6. Step 6: Final answer
    x = 191.81

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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.