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Finding the Fourth Proportional to 15.25, 20.95 and 12.65

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Solution

The fourth proportional to 15.25, 20.95 and 12.65 is: 17.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.25 : 20.95 = 12.65 : x
  2. Step 2: Convert to fraction form
    15.25/20.95 = 12.65/x
  3. Step 3: Cross multiply
    15.25x = 20.95 × 12.65
  4. Step 4: Simplify right side
    15.25x = 265.09
  5. Step 5: Solve for x
    x = 265.09/15.25
  6. Step 6: Final answer
    x = 17.39

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.