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Finding the Fourth Proportional to 13.28, 19.85 and 11.25

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Solution

The fourth proportional to 13.28, 19.85 and 11.25 is: 16.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.28 : 19.85 = 11.25 : x
  2. Step 2: Convert to fraction form
    13.28/19.85 = 11.25/x
  3. Step 3: Cross multiply
    13.28x = 19.85 × 11.25
  4. Step 4: Simplify right side
    13.28x = 223.26
  5. Step 5: Solve for x
    x = 223.26/13.28
  6. Step 6: Final answer
    x = 16.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.