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Finding the Fourth Proportional to 131.01, 196.88 and 79.68

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Solution

The fourth proportional to 131.01, 196.88 and 79.68 is: 119.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.01 : 196.88 = 79.68 : x
  2. Step 2: Convert to fraction form
    131.01/196.88 = 79.68/x
  3. Step 3: Cross multiply
    131.01x = 196.88 × 79.68
  4. Step 4: Simplify right side
    131.01x = 15,687.00
  5. Step 5: Solve for x
    x = 15,687.00/131.01
  6. Step 6: Final answer
    x = 119.74

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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.