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Finding the Fourth Proportional to 131.12, 180 and 118.80

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Solution

The fourth proportional to 131.12, 180 and 118.80 is: 163.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.12 : 180 = 118.80 : x
  2. Step 2: Convert to fraction form
    131.12/180 = 118.80/x
  3. Step 3: Cross multiply
    131.12x = 180 × 118.80
  4. Step 4: Simplify right side
    131.12x = 21,384
  5. Step 5: Solve for x
    x = 21,384/131.12
  6. Step 6: Final answer
    x = 163.09

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.