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Finding the Fourth Proportional to 17.21, 23.77 and 15.29

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Solution

The fourth proportional to 17.21, 23.77 and 15.29 is: 21.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.21 : 23.77 = 15.29 : x
  2. Step 2: Convert to fraction form
    17.21/23.77 = 15.29/x
  3. Step 3: Cross multiply
    17.21x = 23.77 × 15.29
  4. Step 4: Simplify right side
    17.21x = 363.39
  5. Step 5: Solve for x
    x = 363.39/17.21
  6. Step 6: Final answer
    x = 21.11

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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.