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Finding the Fourth Proportional to 121.07, 181.37 and 86.73

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Solution

The fourth proportional to 121.07, 181.37 and 86.73 is: 129.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.07 : 181.37 = 86.73 : x
  2. Step 2: Convert to fraction form
    121.07/181.37 = 86.73/x
  3. Step 3: Cross multiply
    121.07x = 181.37 × 86.73
  4. Step 4: Simplify right side
    121.07x = 15,729.79
  5. Step 5: Solve for x
    x = 15,729.79/121.07
  6. Step 6: Final answer
    x = 129.93

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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.