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Finding the Fourth Proportional to 11.90, 17.75 and 11.06

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Solution

The fourth proportional to 11.90, 17.75 and 11.06 is: 16.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.90 : 17.75 = 11.06 : x
  2. Step 2: Convert to fraction form
    11.90/17.75 = 11.06/x
  3. Step 3: Cross multiply
    11.90x = 17.75 × 11.06
  4. Step 4: Simplify right side
    11.90x = 196.32
  5. Step 5: Solve for x
    x = 196.32/11.90
  6. Step 6: Final answer
    x = 16.50

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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.