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Finding the Fourth Proportional to 12.15, 16.67 and 11.00

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Solution

The fourth proportional to 12.15, 16.67 and 11.00 is: 15.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.15 : 16.67 = 11.00 : x
  2. Step 2: Convert to fraction form
    12.15/16.67 = 11.00/x
  3. Step 3: Cross multiply
    12.15x = 16.67 × 11.00
  4. Step 4: Simplify right side
    12.15x = 183.31
  5. Step 5: Solve for x
    x = 183.31/12.15
  6. Step 6: Final answer
    x = 15.09

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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.