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Finding the Fourth Proportional to 11.25, 15.48 and 11.21

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Solution

The fourth proportional to 11.25, 15.48 and 11.21 is: 15.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.25 : 15.48 = 11.21 : x
  2. Step 2: Convert to fraction form
    11.25/15.48 = 11.21/x
  3. Step 3: Cross multiply
    11.25x = 15.48 × 11.21
  4. Step 4: Simplify right side
    11.25x = 173.45
  5. Step 5: Solve for x
    x = 173.45/11.25
  6. Step 6: Final answer
    x = 15.42

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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.