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Finding the Fourth Proportional to 15.44, 21.24 and 13.11

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Solution

The fourth proportional to 15.44, 21.24 and 13.11 is: 18.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.44 : 21.24 = 13.11 : x
  2. Step 2: Convert to fraction form
    15.44/21.24 = 13.11/x
  3. Step 3: Cross multiply
    15.44x = 21.24 × 13.11
  4. Step 4: Simplify right side
    15.44x = 278.46
  5. Step 5: Solve for x
    x = 278.46/15.44
  6. Step 6: Final answer
    x = 18.04

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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.