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Finding the Fourth Proportional to 180.68, 249.44 and 121.75

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Solution

The fourth proportional to 180.68, 249.44 and 121.75 is: 168.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.68 : 249.44 = 121.75 : x
  2. Step 2: Convert to fraction form
    180.68/249.44 = 121.75/x
  3. Step 3: Cross multiply
    180.68x = 249.44 × 121.75
  4. Step 4: Simplify right side
    180.68x = 30,368.71
  5. Step 5: Solve for x
    x = 30,368.71/180.68
  6. Step 6: Final answer
    x = 168.08

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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.