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Finding the Fourth Proportional to 180.21, 248.70 and 121.22

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Solution

The fourth proportional to 180.21, 248.70 and 121.22 is: 167.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.21 : 248.70 = 121.22 : x
  2. Step 2: Convert to fraction form
    180.21/248.70 = 121.22/x
  3. Step 3: Cross multiply
    180.21x = 248.70 × 121.22
  4. Step 4: Simplify right side
    180.21x = 30,147.41
  5. Step 5: Solve for x
    x = 30,147.41/180.21
  6. Step 6: Final answer
    x = 167.29

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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.