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Finding the Fourth Proportional to 131.15, 196.62 and 79.80

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Solution

The fourth proportional to 131.15, 196.62 and 79.80 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.15 : 196.62 = 79.80 : x
  2. Step 2: Convert to fraction form
    131.15/196.62 = 79.80/x
  3. Step 3: Cross multiply
    131.15x = 196.62 × 79.80
  4. Step 4: Simplify right side
    131.15x = 15,690.28
  5. Step 5: Solve for x
    x = 15,690.28/131.15
  6. Step 6: Final answer
    x = 119.64

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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.