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Finding the Fourth Proportional to 11.81, 17.62 and 11.75

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Solution

The fourth proportional to 11.81, 17.62 and 11.75 is: 17.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.81 : 17.62 = 11.75 : x
  2. Step 2: Convert to fraction form
    11.81/17.62 = 11.75/x
  3. Step 3: Cross multiply
    11.81x = 17.62 × 11.75
  4. Step 4: Simplify right side
    11.81x = 206.92
  5. Step 5: Solve for x
    x = 206.92/11.81
  6. Step 6: Final answer
    x = 17.52

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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.