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Finding the Fourth Proportional to 255.00, 351.89 and 138.56

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Solution

The fourth proportional to 255.00, 351.89 and 138.56 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.00 : 351.89 = 138.56 : x
  2. Step 2: Convert to fraction form
    255.00/351.89 = 138.56/x
  3. Step 3: Cross multiply
    255.00x = 351.89 × 138.56
  4. Step 4: Simplify right side
    255.00x = 48,759.54
  5. Step 5: Solve for x
    x = 48,759.54/255.00
  6. Step 6: Final answer
    x = 191.21

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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.