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Finding the Fourth Proportional to 19.26, 28.91 and 11.25

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Solution

The fourth proportional to 19.26, 28.91 and 11.25 is: 16.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.26 : 28.91 = 11.25 : x
  2. Step 2: Convert to fraction form
    19.26/28.91 = 11.25/x
  3. Step 3: Cross multiply
    19.26x = 28.91 × 11.25
  4. Step 4: Simplify right side
    19.26x = 325.27
  5. Step 5: Solve for x
    x = 325.27/19.26
  6. Step 6: Final answer
    x = 16.89

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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.