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Finding the Fourth Proportional to 11.25, 16.78 and 10.65

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Solution

The fourth proportional to 11.25, 16.78 and 10.65 is: 15.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.25 : 16.78 = 10.65 : x
  2. Step 2: Convert to fraction form
    11.25/16.78 = 10.65/x
  3. Step 3: Cross multiply
    11.25x = 16.78 × 10.65
  4. Step 4: Simplify right side
    11.25x = 178.57
  5. Step 5: Solve for x
    x = 178.57/11.25
  6. Step 6: Final answer
    x = 15.88

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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.