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Finding the Fourth Proportional to 12.15, 16.75 and 8.52

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Solution

The fourth proportional to 12.15, 16.75 and 8.52 is: 11.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.15 : 16.75 = 8.52 : x
  2. Step 2: Convert to fraction form
    12.15/16.75 = 8.52/x
  3. Step 3: Cross multiply
    12.15x = 16.75 × 8.52
  4. Step 4: Simplify right side
    12.15x = 142.66
  5. Step 5: Solve for x
    x = 142.66/12.15
  6. Step 6: Final answer
    x = 11.74

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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.