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Finding the Fourth Proportional to 180.26, 269.88 and 138.90

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Solution

The fourth proportional to 180.26, 269.88 and 138.90 is: 207.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.26 : 269.88 = 138.90 : x
  2. Step 2: Convert to fraction form
    180.26/269.88 = 138.90/x
  3. Step 3: Cross multiply
    180.26x = 269.88 × 138.90
  4. Step 4: Simplify right side
    180.26x = 37,486.33
  5. Step 5: Solve for x
    x = 37,486.33/180.26
  6. Step 6: Final answer
    x = 207.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.