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Finding the Fourth Proportional to 131.31, 196.78 and 50.11

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Solution

The fourth proportional to 131.31, 196.78 and 50.11 is: 75.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.31 : 196.78 = 50.11 : x
  2. Step 2: Convert to fraction form
    131.31/196.78 = 50.11/x
  3. Step 3: Cross multiply
    131.31x = 196.78 × 50.11
  4. Step 4: Simplify right side
    131.31x = 9,860.65
  5. Step 5: Solve for x
    x = 9,860.65/131.31
  6. Step 6: Final answer
    x = 75.09

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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.