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Finding the Fourth Proportional to 180.76, 270.98 and 72.56

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Solution

The fourth proportional to 180.76, 270.98 and 72.56 is: 108.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.76 : 270.98 = 72.56 : x
  2. Step 2: Convert to fraction form
    180.76/270.98 = 72.56/x
  3. Step 3: Cross multiply
    180.76x = 270.98 × 72.56
  4. Step 4: Simplify right side
    180.76x = 19,662.31
  5. Step 5: Solve for x
    x = 19,662.31/180.76
  6. Step 6: Final answer
    x = 108.78

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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.