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Finding the Fourth Proportional to 131.76, 196.68 and 120.36

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Solution

The fourth proportional to 131.76, 196.68 and 120.36 is: 179.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.76 : 196.68 = 120.36 : x
  2. Step 2: Convert to fraction form
    131.76/196.68 = 120.36/x
  3. Step 3: Cross multiply
    131.76x = 196.68 × 120.36
  4. Step 4: Simplify right side
    131.76x = 23,672.40
  5. Step 5: Solve for x
    x = 23,672.40/131.76
  6. Step 6: Final answer
    x = 179.66

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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.