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Finding the Fourth Proportional to 18.72, 28.20 and 14.24

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Solution

The fourth proportional to 18.72, 28.20 and 14.24 is: 21.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.72 : 28.20 = 14.24 : x
  2. Step 2: Convert to fraction form
    18.72/28.20 = 14.24/x
  3. Step 3: Cross multiply
    18.72x = 28.20 × 14.24
  4. Step 4: Simplify right side
    18.72x = 401.57
  5. Step 5: Solve for x
    x = 401.57/18.72
  6. Step 6: Final answer
    x = 21.45

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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.