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Finding the Fourth Proportional to 118.80, 164.14 and 103.21

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Solution

The fourth proportional to 118.80, 164.14 and 103.21 is: 142.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.80 : 164.14 = 103.21 : x
  2. Step 2: Convert to fraction form
    118.80/164.14 = 103.21/x
  3. Step 3: Cross multiply
    118.80x = 164.14 × 103.21
  4. Step 4: Simplify right side
    118.80x = 16,940.22
  5. Step 5: Solve for x
    x = 16,940.22/118.80
  6. Step 6: Final answer
    x = 142.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.