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Finding the Fourth Proportional to 180.95, 249.78 and 115.46

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Solution

The fourth proportional to 180.95, 249.78 and 115.46 is: 159.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.95 : 249.78 = 115.46 : x
  2. Step 2: Convert to fraction form
    180.95/249.78 = 115.46/x
  3. Step 3: Cross multiply
    180.95x = 249.78 × 115.46
  4. Step 4: Simplify right side
    180.95x = 28,839.60
  5. Step 5: Solve for x
    x = 28,839.60/180.95
  6. Step 6: Final answer
    x = 159.38

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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.