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Finding the Fourth Proportional to 18.22, 25.12 and 11.30

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Solution

The fourth proportional to 18.22, 25.12 and 11.30 is: 15.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.22 : 25.12 = 11.30 : x
  2. Step 2: Convert to fraction form
    18.22/25.12 = 11.30/x
  3. Step 3: Cross multiply
    18.22x = 25.12 × 11.30
  4. Step 4: Simplify right side
    18.22x = 283.90
  5. Step 5: Solve for x
    x = 283.90/18.22
  6. Step 6: Final answer
    x = 15.59

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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.