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Finding the Fourth Proportional to 18.65, 28.11 and 16.43

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Solution

The fourth proportional to 18.65, 28.11 and 16.43 is: 24.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.65 : 28.11 = 16.43 : x
  2. Step 2: Convert to fraction form
    18.65/28.11 = 16.43/x
  3. Step 3: Cross multiply
    18.65x = 28.11 × 16.43
  4. Step 4: Simplify right side
    18.65x = 461.71
  5. Step 5: Solve for x
    x = 461.71/18.65
  6. Step 6: Final answer
    x = 24.76

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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.