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Finding the Fourth Proportional to 18.80, 28.31 and 14.81

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Solution

The fourth proportional to 18.80, 28.31 and 14.81 is: 22.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.80 : 28.31 = 14.81 : x
  2. Step 2: Convert to fraction form
    18.80/28.31 = 14.81/x
  3. Step 3: Cross multiply
    18.80x = 28.31 × 14.81
  4. Step 4: Simplify right side
    18.80x = 419.27
  5. Step 5: Solve for x
    x = 419.27/18.80
  6. Step 6: Final answer
    x = 22.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.