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Finding the Fourth Proportional to 131.12, 196.49 and 49.85

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Solution

The fourth proportional to 131.12, 196.49 and 49.85 is: 74.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.12 : 196.49 = 49.85 : x
  2. Step 2: Convert to fraction form
    131.12/196.49 = 49.85/x
  3. Step 3: Cross multiply
    131.12x = 196.49 × 49.85
  4. Step 4: Simplify right side
    131.12x = 9,794.17
  5. Step 5: Solve for x
    x = 9,794.17/131.12
  6. Step 6: Final answer
    x = 74.70

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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.