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Finding the Fourth Proportional to 255.09, 352.04 and 138.66

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Solution

The fourth proportional to 255.09, 352.04 and 138.66 is: 191.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.09 : 352.04 = 138.66 : x
  2. Step 2: Convert to fraction form
    255.09/352.04 = 138.66/x
  3. Step 3: Cross multiply
    255.09x = 352.04 × 138.66
  4. Step 4: Simplify right side
    255.09x = 48,811.85
  5. Step 5: Solve for x
    x = 48,811.85/255.09
  6. Step 6: Final answer
    x = 191.35

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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.