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Finding the Fourth Proportional to 18.28, 25.18 and 14.20

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Solution

The fourth proportional to 18.28, 25.18 and 14.20 is: 19.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.28 : 25.18 = 14.20 : x
  2. Step 2: Convert to fraction form
    18.28/25.18 = 14.20/x
  3. Step 3: Cross multiply
    18.28x = 25.18 × 14.20
  4. Step 4: Simplify right side
    18.28x = 357.56
  5. Step 5: Solve for x
    x = 357.56/18.28
  6. Step 6: Final answer
    x = 19.56

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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.