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Finding the Fourth Proportional to 17.72, 26.38 and 17.21

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Solution

The fourth proportional to 17.72, 26.38 and 17.21 is: 25.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.72 : 26.38 = 17.21 : x
  2. Step 2: Convert to fraction form
    17.72/26.38 = 17.21/x
  3. Step 3: Cross multiply
    17.72x = 26.38 × 17.21
  4. Step 4: Simplify right side
    17.72x = 453.99
  5. Step 5: Solve for x
    x = 453.99/17.72
  6. Step 6: Final answer
    x = 25.62

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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.