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Finding the Fourth Proportional to 121.28, 181.80 and 118.44

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Solution

The fourth proportional to 121.28, 181.80 and 118.44 is: 177.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.28 : 181.80 = 118.44 : x
  2. Step 2: Convert to fraction form
    121.28/181.80 = 118.44/x
  3. Step 3: Cross multiply
    121.28x = 181.80 × 118.44
  4. Step 4: Simplify right side
    121.28x = 21,532.39
  5. Step 5: Solve for x
    x = 21,532.39/121.28
  6. Step 6: Final answer
    x = 177.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.