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Finding the Fourth Proportional to 255.34, 352.38 and 138.91

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Solution

The fourth proportional to 255.34, 352.38 and 138.91 is: 191.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.34 : 352.38 = 138.91 : x
  2. Step 2: Convert to fraction form
    255.34/352.38 = 138.91/x
  3. Step 3: Cross multiply
    255.34x = 352.38 × 138.91
  4. Step 4: Simplify right side
    255.34x = 48,947.09
  5. Step 5: Solve for x
    x = 48,947.09/255.34
  6. Step 6: Final answer
    x = 191.69

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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.