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Finding the Fourth Proportional to 17.28, 23.79 and 15.55

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Solution

The fourth proportional to 17.28, 23.79 and 15.55 is: 21.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.28 : 23.79 = 15.55 : x
  2. Step 2: Convert to fraction form
    17.28/23.79 = 15.55/x
  3. Step 3: Cross multiply
    17.28x = 23.79 × 15.55
  4. Step 4: Simplify right side
    17.28x = 369.93
  5. Step 5: Solve for x
    x = 369.93/17.28
  6. Step 6: Final answer
    x = 21.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.