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Finding the Fourth Proportional to 19.16, 28.72 and 12.38

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Solution

The fourth proportional to 19.16, 28.72 and 12.38 is: 18.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.16 : 28.72 = 12.38 : x
  2. Step 2: Convert to fraction form
    19.16/28.72 = 12.38/x
  3. Step 3: Cross multiply
    19.16x = 28.72 × 12.38
  4. Step 4: Simplify right side
    19.16x = 355.59
  5. Step 5: Solve for x
    x = 355.59/19.16
  6. Step 6: Final answer
    x = 18.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.