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Finding the Fourth Proportional to 131.30, 195.99 and 121.79

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Solution

The fourth proportional to 131.30, 195.99 and 121.79 is: 181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.30 : 195.99 = 121.79 : x
  2. Step 2: Convert to fraction form
    131.30/195.99 = 121.79/x
  3. Step 3: Cross multiply
    131.30x = 195.99 × 121.79
  4. Step 4: Simplify right side
    131.30x = 23,869.66
  5. Step 5: Solve for x
    x = 23,869.66/131.30
  6. Step 6: Final answer
    x = 181.80

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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.