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Finding the Fourth Proportional to 18.39, 25.36 and 13.21

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Solution

The fourth proportional to 18.39, 25.36 and 13.21 is: 18.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.39 : 25.36 = 13.21 : x
  2. Step 2: Convert to fraction form
    18.39/25.36 = 13.21/x
  3. Step 3: Cross multiply
    18.39x = 25.36 × 13.21
  4. Step 4: Simplify right side
    18.39x = 335.01
  5. Step 5: Solve for x
    x = 335.01/18.39
  6. Step 6: Final answer
    x = 18.22

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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.