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Finding the Fourth Proportional to 12.05, 17.99 and 11.80

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Solution

The fourth proportional to 12.05, 17.99 and 11.80 is: 17.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.05 : 17.99 = 11.80 : x
  2. Step 2: Convert to fraction form
    12.05/17.99 = 11.80/x
  3. Step 3: Cross multiply
    12.05x = 17.99 × 11.80
  4. Step 4: Simplify right side
    12.05x = 212.18
  5. Step 5: Solve for x
    x = 212.18/12.05
  6. Step 6: Final answer
    x = 17.60

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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.