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Finding the Fourth Proportional to 179.72, 248.09 and 121.80

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Solution

The fourth proportional to 179.72, 248.09 and 121.80 is: 168.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.72 : 248.09 = 121.80 : x
  2. Step 2: Convert to fraction form
    179.72/248.09 = 121.80/x
  3. Step 3: Cross multiply
    179.72x = 248.09 × 121.80
  4. Step 4: Simplify right side
    179.72x = 30,217.67
  5. Step 5: Solve for x
    x = 30,217.67/179.72
  6. Step 6: Final answer
    x = 168.14

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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.