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Finding the Fourth Proportional to 12.15, 16.68 and 10.10

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Solution

The fourth proportional to 12.15, 16.68 and 10.10 is: 13.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.15 : 16.68 = 10.10 : x
  2. Step 2: Convert to fraction form
    12.15/16.68 = 10.10/x
  3. Step 3: Cross multiply
    12.15x = 16.68 × 10.10
  4. Step 4: Simplify right side
    12.15x = 168.38
  5. Step 5: Solve for x
    x = 168.38/12.15
  6. Step 6: Final answer
    x = 13.86

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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.