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Finding the Fourth Proportional to 16.91, 25.36 and 13.11

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Solution

The fourth proportional to 16.91, 25.36 and 13.11 is: 19.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.91 : 25.36 = 13.11 : x
  2. Step 2: Convert to fraction form
    16.91/25.36 = 13.11/x
  3. Step 3: Cross multiply
    16.91x = 25.36 × 13.11
  4. Step 4: Simplify right side
    16.91x = 332.47
  5. Step 5: Solve for x
    x = 332.47/16.91
  6. Step 6: Final answer
    x = 19.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.