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Finding the Fourth Proportional to 180.78, 249.54 and 118.59

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Solution

The fourth proportional to 180.78, 249.54 and 118.59 is: 163.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.78 : 249.54 = 118.59 : x
  2. Step 2: Convert to fraction form
    180.78/249.54 = 118.59/x
  3. Step 3: Cross multiply
    180.78x = 249.54 × 118.59
  4. Step 4: Simplify right side
    180.78x = 29,592.95
  5. Step 5: Solve for x
    x = 29,592.95/180.78
  6. Step 6: Final answer
    x = 163.70

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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.