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Finding the Fourth Proportional to 180.21, 270.13 and 71.85

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Solution

The fourth proportional to 180.21, 270.13 and 71.85 is: 107.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.21 : 270.13 = 71.85 : x
  2. Step 2: Convert to fraction form
    180.21/270.13 = 71.85/x
  3. Step 3: Cross multiply
    180.21x = 270.13 × 71.85
  4. Step 4: Simplify right side
    180.21x = 19,408.84
  5. Step 5: Solve for x
    x = 19,408.84/180.21
  6. Step 6: Final answer
    x = 107.70

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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.