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Finding the Fourth Proportional to 131.18, 195.82 and 121.66

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Solution

The fourth proportional to 131.18, 195.82 and 121.66 is: 181.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.18 : 195.82 = 121.66 : x
  2. Step 2: Convert to fraction form
    131.18/195.82 = 121.66/x
  3. Step 3: Cross multiply
    131.18x = 195.82 × 121.66
  4. Step 4: Simplify right side
    131.18x = 23,823.46
  5. Step 5: Solve for x
    x = 23,823.46/131.18
  6. Step 6: Final answer
    x = 181.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.