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Finding the Fourth Proportional to 131.31, 196.97 and 77.18

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Solution

The fourth proportional to 131.31, 196.97 and 77.18 is: 115.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.31 : 196.97 = 77.18 : x
  2. Step 2: Convert to fraction form
    131.31/196.97 = 77.18/x
  3. Step 3: Cross multiply
    131.31x = 196.97 × 77.18
  4. Step 4: Simplify right side
    131.31x = 15,200.77
  5. Step 5: Solve for x
    x = 15,200.77/131.31
  6. Step 6: Final answer
    x = 115.76

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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.